
A carrack (; ; ) is a three- or four-
masted ocean-going
sailing ship
A sailing ship is a sea-going vessel that uses sails mounted on Mast (sailing), masts to harness the power of wind and propel the vessel. There is a variety of sail plans that propel sailing ships, employing Square rig, square-rigged or Fore-an ...
that was developed in the 14th to 15th centuries in Europe, most notably in
Portugal
Portugal, officially the Portuguese Republic, is a country on the Iberian Peninsula in Southwestern Europe. Featuring Cabo da Roca, the westernmost point in continental Europe, Portugal borders Spain to its north and east, with which it share ...
and
Spain
Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
. Evolving from the single-masted
cog, the carrack was first used for European trade from the Mediterranean to the Baltic and quickly found use with the newly found wealth of the trade between Europe and Africa and then the trans-Atlantic trade with the Americas. In their most advanced forms, they were used by the
Portuguese and
Spaniards
Spaniards, or Spanish people, are a Romance-speaking ethnic group native to the Iberian Peninsula, primarily associated with the modern nation-state of Spain. Genetically and ethnolinguistically, Spaniards belong to the broader Southern a ...
for trade between Europe, Africa and Asia starting in the late 15th century, before being gradually superseded in the late 16th and early 17th centuries by the
galleon
Galleons were large, multi-decked sailing ships developed in Spain and Portugal.
They were first used as armed cargo carriers by Europe, Europeans from the 16th to 18th centuries during the Age of Sail, and they were the principal vessels dr ...
.
In its most developed form, the carrack was a
carvel-built ocean-going ship: large enough to be stable in heavy seas, and capacious enough to carry a large cargo and the provisions needed for very long voyages. The later carracks were
square-rigged on the
foremast
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the median line of a ship or boat. Its purposes include carrying sails, spars, and derricks, giving necessary height to a navigation light ...
and
mainmast
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the median line of a ship or boat. Its purposes include carrying sails, spars, and derricks, giving necessary height to a navigation light ...
and
lateen
A lateen (from French ''latine'', meaning "Latin") or latin-rig is a triangular sail set on a long Yard (sailing) , yard mounted at an angle on the mast (sailing) , mast, and running in a fore-and-aft direction. The Settee (sail), settee can be ...
-
rigged on the
mizzenmast. They had a high rounded
stern
The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite the bow, the foremost part of a ship. O ...
with
aftcastle,
forecastle
The forecastle ( ; contracted as fo'c'sle or fo'c's'le) is the upper deck (ship), deck of a sailing ship forward of the foremast, or, historically, the forward part of a ship with the sailors' living quarters. Related to the latter meaning is t ...
and
bowsprit
The bowsprit of a sailing vessel is a spar (sailing), spar extending forward from the vessel's prow. The bowsprit is typically held down by a bobstay that counteracts the forces from the forestay, forestays. The bowsprit’s purpose is to create ...
at the stem. As the predecessor of the
galleon
Galleons were large, multi-decked sailing ships developed in Spain and Portugal.
They were first used as armed cargo carriers by Europe, Europeans from the 16th to 18th centuries during the Age of Sail, and they were the principal vessels dr ...
, the carrack was one of the most influential ship designs in history; while ships became more specialized in the following centuries, the basic design remained unchanged throughout this period.
Name
English ''carrack'' was loaned in the late 14th century, via Old French ''caraque'', from ''carraca'', a term for a large, square-rigged sailing vessel used in Spanish, Italian and Middle Latin.
These ships were called ''carraca'' in
Portuguese,
Genoese and
Spanish, ''caraque'' or ''nef'' in
French, and ''kraak'' in
Dutch.
The origin of the term ''carraca'' is unclear, perhaps from Arabic ''qaraqir'' "merchant ship", itself of unknown origin (maybe from Latin ''carricare'' "to load a car" or Greek ''καρκαρίς ''"load of timber") or the
Arabic
Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns lang ...
br>
القُرْقُورُ(''al-qurqoor'') and from thence to the
Greek
Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Europe:
*Greeks, an ethnic group
*Greek language, a branch of the Indo-European language family
**Proto-Greek language, the assumed last common ancestor of all kno ...
(''kerkouros'') meaning approximately
"lighter" (barge) literally, "shorn tail", a possible reference to the ship's flat stern). Its attestation in Greek literature is distributed in two closely related lobes. The first distribution lobe, or area, associates it with certain light and fast merchantmen found near
Cyprus
Cyprus (), officially the Republic of Cyprus, is an island country in the eastern Mediterranean Sea. Situated in West Asia, its cultural identity and geopolitical orientation are overwhelmingly Southeast European. Cyprus is the List of isl ...
and
Corfu
Corfu ( , ) or Kerkyra (, ) is a Greece, Greek island in the Ionian Sea, of the Ionian Islands; including its Greek islands, small satellite islands, it forms the margin of Greece's northwestern frontier. The island is part of the Corfu (regio ...
. The second is an extensive attestation in the
Oxyrhynchus
Oxyrhynchus ( ; , ; ; ), also known by its modern name Al-Bahnasa (), is a city in Middle Egypt located about 160 km south-southwest of Cairo in Minya Governorate. It is also an important archaeological site. Since the late 19th century, t ...
corpus, where it seems most frequently to describe the Nile barges of the
Ptolemaic pharaoh
Pharaoh (, ; Egyptian language, Egyptian: ''wikt:pr ꜥꜣ, pr ꜥꜣ''; Meroitic language, Meroitic: 𐦲𐦤𐦧, ; Biblical Hebrew: ''Parʿō'') was the title of the monarch of ancient Egypt from the First Dynasty of Egypt, First Dynasty ( ...
s. Both of these usages may lead back through the
Phoenician to the
Akkadian ''kalakku'', which denotes a type of river barge. The Akkadian term is assumed to be derived from a
Sumerian antecedent. A modern reflex of the word is found in Arabic and
Turkish ''kelek'' "raft; riverboat".
Origins

By the
Late Middle Ages
The late Middle Ages or late medieval period was the Periodization, period of History of Europe, European history lasting from 1300 to 1500 AD. The late Middle Ages followed the High Middle Ages and preceded the onset of the early modern period ( ...
, the
cog and cog-like square-rigged vessels equipped with a
rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, airship, or other vehicle that moves through a fluid medium (usually air or water). On an airplane, the rudder is used primarily to counter adverse yaw ...
at the
stern
The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite the bow, the foremost part of a ship. O ...
, were widely used along the coasts of Europe, from the Mediterranean, to the Baltic. Given the conditions of the Mediterranean,
galley
A galley is a type of ship optimised for propulsion by oars. Galleys were historically used for naval warfare, warfare, Maritime transport, trade, and piracy mostly in the seas surrounding Europe. It developed in the Mediterranean world during ...
type vessels were extensively used there, as were various two masted vessels, including the
caravels with their lateen sails. These and similar ship types were familiar to Portuguese navigators and shipwrights. As the Portuguese and Spaniards gradually extended their trade ever further south along Africa's Atlantic coast and islands during the 15th century, they needed larger, more durable and more advanced sailing ships for their long oceanic ventures. Gradually, they developed their own models of oceanic carracks from a fusion and modification of aspects of the ship types they knew operating in both the Atlantic and Mediterranean, generalizing their use in the end of the century for inter-oceanic travel with a more advanced form of sail rigging that allowed much improved sailing characteristics in the heavy winds and waves of the Atlantic Ocean and a hull shape and size that permitted larger cargoes. In addition to the average tonnage naus, some naus (carracks) were also built in the reign of
John II of Portugal
John II (; ; 3 May 1455 – 25 October 1495), called the Perfect Prince (), was King of Portugal from 1481 until his death in 1495, and also for a brief time in 1477. He is known for reestablishing the power of the Portuguese monarchy, reinvigo ...
, but were widespread only after the turn of the century. The Portuguese carracks were usually very large ships for their time, often over 1000 tons
displacement
Displacement may refer to:
Physical sciences
Mathematics and physics
*Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
, and having the future naus of the
India run and of the China and Japan trade, also other new types of design.
A typical three-masted carrack such as the
''São Gabriel'' had six sails: bowsprit, foresail, mainsail, mizzensail and two topsails.

In the
Republic of Ragusa
The Republic of Ragusa, or the Republic of Dubrovnik, was an maritime republics, aristocratic maritime republic centered on the city of Dubrovnik (''Ragusa'' in Italian and Latin; ''Raguxa'' in Venetian) in South Dalmatia (today in southernmost ...
, a kind of a three or four masted carrack called ''Dubrovačka karaka'' (Dubrovnik Carrack) was used between the 14th and the 17th century for cargo transport.
In the middle of the 16th century, the first
galleon
Galleons were large, multi-decked sailing ships developed in Spain and Portugal.
They were first used as armed cargo carriers by Europe, Europeans from the 16th to 18th centuries during the Age of Sail, and they were the principal vessels dr ...
s were developed from the carrack. The galleon design came to replace that of the carrack although carracks were still in use as late as the middle of the 17th century due to their larger cargo capacity.
In Asia
Starting in 1498, Portugal initiated for the first time direct and regular exchanges between Europe and India—and the rest of Asia thereafter—through the
Cape Route
The European-Asian sea route, commonly known as the sea route to India or the Cape Route, is a shipping route from the European coast of the Atlantic Ocean to Asia's coast of the Indian Ocean passing by the Cape of Good Hope and Cape Agulhas ...
, a voyage that required the use of more substantial vessels, such as carracks, due to its unprecedented duration, about six months.
On average, four carracks connected Lisbon to
Goa carrying gold to purchase spices and other exotic items, but mainly pepper. From Goa, one carrack went on to
Ming China
The Ming dynasty, officially the Great Ming, was an Dynasties of China, imperial dynasty of China that ruled from 1368 to 1644, following the collapse of the Mongol Empire, Mongol-led Yuan dynasty. The Ming was the last imperial dynasty of ...
in order to purchase silks. Starting in 1541, the Portuguese began trading with Japan, exchanging Chinese silk for Japanese silver; in 1550 the Portuguese Crown started to regulate
trade
Trade involves the transfer of goods and services from one person or entity to another, often in exchange for money. Economists refer to a system or network that allows trade as a market.
Traders generally negotiate through a medium of cr ...
to
Japan
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
, by leasing the annual "captaincy" to Japan to the highest bidder at Goa, in effect conferring exclusive trading rights for a single carrack bound for Japan every year. In 1557 the Portuguese acquired
Macau
Macau or Macao is a special administrative regions of China, special administrative region of the People's Republic of China (PRC). With a population of about people and a land area of , it is the most List of countries and dependencies by p ...
to develop this trade in partnership with the Chinese. That trade continued with few interruptions until 1638, when it was prohibited by the rulers of Japan on the grounds that the ships were smuggling Catholic priests into the country. The Japanese called Portuguese carracks "
Black Ships" (''kurofune''), referring to the colour of the ship's hulls. This term would eventually come to refer to any Western vessel, not just Portuguese.
The Islamic world also built and used carracks, or at least carrack-like ships, in the Mediterranean and the Indian Ocean. A picture of an Ottoman ''barca'' on Piri Reis' map shows a deep-hulled ship with a tall forecastle and a lateen sail on the mizzenmast.
The ''harraqa'' (Saracen: ''karaque'') was a type of ship used to hurl explosives or inflammable materials (firebomb in earthenware pots,
naphtha
Naphtha (, recorded as less common or nonstandard in all dictionaries: ) is a flammable liquid hydrocarbon mixture. Generally, it is a fraction of crude oil, but it can also be produced from natural-gas condensates, petroleum distillates, and ...
, fire arrows). From the context of Islamic texts, there are two types of ''harraqa'': The cargo ship and the smaller longship (galley-like) that was used for fighting. It is unclear whether the nomenclature ''harraqa'' has a connection with European ''carraca'' (carrack), or whether one influences the other. One Muslim ''harraqa'' named ''Mogarbina'' was captured by the
Knights of St. John in 1507 from the Ottoman Turks and renamed ''Santa Maria''.
Gujarati ships are usually called ''naos'' (carracks) by the Portuguese. Gujarati ''naos'' operated between Malacca and the Red Sea, and were often larger than Portuguese carracks. The
Bengalis
Bengalis ( ), also rendered as endonym and exonym, endonym Bangalee, are an Indo-Aryan peoples, Indo-Aryan ethnolinguistic group originating from and culturally affiliated with the Bengal region of South Asia. The current population is divi ...
also used carracks, sometimes called ''naos mauriscas'' (Moorish carracks) by the Portuguese. Arabs merchants of Mecca apparently used carracks too, since
Duarte Barbosa noted that the Bengali people have "great ''naos'' after the fashion of Mecca".
[Manguin, Pierre-Yves. 2012. "Asian shipbuilding traditions in the Indian Ocean at the dawn of European expansion", in: Om Prakash and D. P. Chattopadhyaya (eds), ''History of science, philosophy, and culture in Indian Civilization'', Volume III, Part 7: The trading world of the Indian Ocean, 1500–1800, pp. 597–629. Delhi, Chennai, Chandigarh: Pearson.]
Famous carracks
*
''Santa María'', in which
Christopher Columbus
Christopher Columbus (; between 25 August and 31 October 1451 – 20 May 1506) was an Italians, Italian explorer and navigator from the Republic of Genoa who completed Voyages of Christopher Columbus, four Spanish-based voyages across the At ...
made his first voyage to America in 1492.
*
Gribshunden, flagship of the Danish-Norwegian King Hans, built in the Low Countries 1485 and served the Danish-Norwegian crown until sinking in June 1495.
*
''São Gabriel'', flagship of
Vasco da Gama
Vasco da Gama ( , ; – 24 December 1524), was a Portuguese explorer and nobleman who was the Portuguese discovery of the sea route to India, first European to reach India by sea.
Da Gama's first voyage (1497–1499) was the first to link ...
, in the 1497 Portuguese expedition from Europe to India by circumnavigating Africa.
* ''
Flor do Mar'' or ''Flor de la Mar'', as it was called, served over nine years in the
Indian Ocean
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...
, sinking in 1512 with
Afonso de Albuquerque after the
conquest of Malacca with a huge booty, making it one of the legendary lost treasures.
*
''Victoria'', the first ship in history to circumnavigate the globe (1519 to 1522), and the only survivor of
Magellan's expedition for Spain.
* ''
La Dauphine'',
Verrazzano's ship to explore the Atlantic coast of North America in 1524.
* ''
Grande Hermine'', in which
Jacques Cartier
Jacques Cartier (; 31 December 14911 September 1557) was a French maritime explorer from Brittany. Jacques Cartier was the first Europeans, European to describe and map the Gulf of Saint Lawrence and the shores of the Saint Lawrence River, wh ...
first navigated the
Saint Lawrence River
The St. Lawrence River (, ) is a large international river in the middle latitudes of North America connecting the Great Lakes to the North Atlantic Ocean. Its waters flow in a northeasterly direction from Lake Ontario to the Gulf of St. Lawrenc ...
in 1535. The first European ship to sail on this river past the Gulf.
* ''Santo António'', or ''St. Anthony'', the personal property of King
John III of Portugal, wrecked off
Gunwalloe Bay in 1527, the salvage of whose cargo almost led to a war between England and Portugal.
* ''
Great Michael'', a Scottish ship, at one time the largest in Europe.
* ''
Mary Rose
The ''Mary Rose'' was a carrack in the English Tudor navy of Henry VIII of England, King Henry VIII. She was launched in 1511 and served for 34 years in several wars against France, Scotland, and Brittany. After being substantially rebuilt in ...
'', ''
Henri Grâce à Dieu'' and ''
Peter Pomegranate
''Peter Pomegranate'' was a warship of the English Tudor navy, built in 1510. Her name most likely was in honour of Saint Peter and the badge of Queen Catherine of Aragon, a pomegranate.
History
She had a tonnage of 400 or 450 when first bu ...
'', built during the reign of King
Henry VIII of England
Henry VIII (28 June 149128 January 1547) was King of England from 22 April 1509 until his death in 1547. Henry is known for his Wives of Henry VIII, six marriages and his efforts to have his first marriage (to Catherine of Aragon) annulled. ...
— English military carracks like these were often called
great ships.
* ''
Grace Dieu'', commissioned by King
Henry V of England
Henry V (16 September 1386 – 31 August 1422), also called Henry of Monmouth, was King of England from 1413 until his death in 1422. Despite his relatively short reign, Henry's outstanding military successes in the Hundred Years' War against ...
. One of the largest ships in the world at the time.
* ''
Santa Catarina do Monte Sinai'', a war ship built in
India
India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
by the Portuguese
* ''
Santa Anna'', a particularly modern design commissioned by the
Knights Hospitaller
The Order of Knights of the Hospital of Saint John of Jerusalem, commonly known as the Knights Hospitaller (), is a Catholic military order. It was founded in the crusader Kingdom of Jerusalem in the 12th century and had headquarters there ...
in 1522 and sometimes hailed as the first armoured ship.
* ''
Jesus of Lübeck'', chartered to a group of merchants in 1563 by Queen
Elizabeth I of England
Elizabeth I (7 September 153324 March 1603) was Queen of England and Ireland from 17 November 1558 until her death in 1603. She was the last and longest reigning monarch of the House of Tudor. Her eventful reign, and its effect on history ...
. ''Jesus of Lübeck'' became involved in the Atlantic slave trade under
John Hawkins.
* ''
Madre de Deus'', built in Lisbon during 1589, she was one of the world's largest ships. She was
captured by the English off
Flores Island in 1592 with an enormously valuable cargo from the
East Indies
The East Indies (or simply the Indies) is a term used in historical narratives of the Age of Discovery. The ''Indies'' broadly referred to various lands in Eastern world, the East or the Eastern Hemisphere, particularly the islands and mainl ...
that is still considered the second-largest treasure ever captured.
* ''
Cinco Chagas'', presumed to have been the largest and richest ship to ever sail to and from the Indies until it exploded and sank at the
action of Faial in 1594.
*
''Santa Catarina'', Portuguese carrack which was seized by the
Dutch East India Company
The United East India Company ( ; VOC ), commonly known as the Dutch East India Company, was a chartered company, chartered trading company and one of the first joint-stock companies in the world. Established on 20 March 1602 by the States Ge ...
off
Singapore
Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet. It is about one degree ...
in 1603.
* ''
Nossa Senhora da Graça'', Portuguese carrack sunk in a Japanese attack near Nagasaki in 1610
* ''
Peter von Danzig'', ship of the
Hanseatic League
The Hanseatic League was a Middle Ages, medieval commercial and defensive network of merchant guilds and market towns in Central Europe, Central and Northern Europe, Northern Europe. Growing from a few Northern Germany, North German towns in the ...
in 1460s–1470s.
*''La Gran Carracca'', the ship of the
Order of St. John during their rule over
Malta
Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
.
*''
Bom Jesus'', a Portuguese ship that disappeared in 1533 after sailing from Lisbon. The well preserved shipwreck was discovered in 2008 on the coast of Namibia, along with its cargo of assorted copper ingots, elephant ivory and over 2000 gold and silver coins.
Gallery
File:Holbein - Ausfahrendes Schiff.png, Small 16th-century carrack
File:Frol de la mar in roteiro de malaca.jpeg, Famous Portuguese nau ''Flor de la Mar'' (launched in 1501 or 1502), in the 16th-century "Roteiro de Malaca"
File:NaoVictoria.JPG, A replica
A replica is an exact (usually 1:1 in scale) copy or remake of an object, made out of the same raw materials, whether a molecule, a work of art, or a commercial product. The term is also used for copies that closely resemble the original, without ...
of ''Nao Victoria'', in 1522 the first ship to circumnavigate the globe and the only Magellan ship to return
File:Gustav Adolf Closs - Die Schiffe des Columbus - 1892.jpg, ''Columbus' Ships'' (G.A. Closs, 1892): the ''Santa Maria'' and ''Pinta'' are shown as carracks; the ''Niña'' (left) as a caravel.
File:Carrack Madre de Deus.jpg, Model of the carrack '' Madre de Deus'', in the Maritime Museum
A maritime museum (sometimes nautical museum) is a museum specializing in the display of objects relating to ships and travel on large bodies of water. A subcategory of maritime museums are naval museums, which focus on navy, navies and the m ...
, Lisbon. Built based on another design, later in Portugal (1589), she was one of the largest ship in the world in her time. She had seven decks.
File:Carrack 1565 (cropped).jpg, Portuguese carrack, as depicted in a map made in 1565
File:NanbanCarrack-Enhanced.jpg, Japanese depiction of a Portuguese carrack, dubbed ''kurofune'' (black ship)
File:Fustas, Nau Indiana Piroga, Nau de Meca & Nau de Rumes.jpg, Carracks of the Indian Ocean: Indian carrack "Piroga" — Carrack of Mecca — Carrack of Rumes (Ottoman)
File:A four-masted Turkish warship, Johannes Lewenklau, 1586.jpg, A four-masted Turkish carrack, 1586
Popular culture
The Italian word ''caracca'' and
derivative
In mathematics, the derivative is a fundamental tool that quantifies the sensitivity to change of a function's output with respect to its input. The derivative of a function of a single variable at a chosen input value, when it exists, is t ...
words are popularly used in reference to a cumbersome individual, to an old vessel, or to a vehicle in a very bad condition.
The Portuguese form of "carrack", ''nau'', is used as its unique unit in the ''
Civilization V
''Sid Meier's Civilization V'' is a 4X turn-based strategy video game developed by Firaxis Games and published by 2K (company), 2K. It is the sequel to Civilization IV, ''Civilization IV'', and was released for Microsoft Windows, Windows in Sep ...
'' and ''
Civilization VI
''Sid Meier's Civilization VI'' is a 2016 4X turn-based strategy video game developed by Firaxis Games and published by 2K (company), 2K. The mobile and Nintendo Switch ports were published by Aspyr Media. It is the sequel to ''Civilization V'' ...
'' strategy game.
See also
*
Medieval ships
*
Chinese junk ship
*
Javanese jong
*
Arabs baghlah
*
Portuguese India Armadas
The Portuguese Indian Armadas (; meaning "Armadas of India") were the fleets of ships funded by the Crown of Portugal, and dispatched on an annual basis from Kingdom of Portugal, Portugal to Portuguese India, India. The principal destination w ...
References
Further reading
*
*
External links
*
*
The Development of the Square-Rigged Ship: ''from the carrack to the full-rigger''Computer modeling of a Portuguese carrack''Dubrovačka karaka'' (Dubrovnik Carrack) – a kind of a three or four masted carrack used between the 14th and the 17th century for cargo transport in the Republic of RagusaCarrack (karaka) – a large three-masted cargo sailing ship in the 14th–17th centuries
{{Authority control
Age of Sail ships
Exploration ships
Maritime history of Portugal
Merchant sailing ship types
Portuguese inventions
Ship designs of the Spanish Empire
Economy of the Republic of Ragusa
History of Dubrovnik
14th-century ships
15th-century ships
16th-century ships
17th-century ships
Tourist attractions in Dubrovnik