
Secret passages, also commonly referred to as hidden passages or secret tunnels, are hidden routes used for stealthy travel, escape, or movement of people and goods. They are sometimes inside buildings leading to
secret rooms. Others allow people to enter or exit buildings without being seen. Hidden passages and secret rooms have been built in castles and houses owned by heads of state, the wealthy, criminals, and abolitionists associated with the American
Underground Railroad. They have helped besieged rulers escape attackers, including
Pope Alexander VI
Pope Alexander VI ( it, Alessandro VI, va, Alexandre VI, es, Alejandro VI; born Rodrigo de Borja; ca-valencia, Roderic Llançol i de Borja ; es, Rodrigo Lanzol y de Borja, lang ; 1431 – 18 August 1503) was head of the Catholic Churc ...
in 1494,
Pope Clement VII in 1527 and
Marie Antoinette
Marie Antoinette Josèphe Jeanne (; ; née Maria Antonia Josepha Johanna; 2 November 1755 – 16 October 1793) was the last queen of France before the French Revolution. She was born an archduchess of Austria, and was the penultimate child a ...
in 1789. Passages and tunnels have been used by criminals, armies (notably the
Viet Cong in the
Vietnam War) and political organizations to smuggle goods and people or conceal their activities.
Appearance and construction
Entrances to some secret passages appear as architectural features, such as a fireplaces or built-in
sliding bookcases. Some entrances are more elaborately concealed and can be opened only by engaging a hidden mechanism or locking device. Others are much simpler; for example, a
trapdoor hidden under a rug.
Some buildings have secret areas built into their original plans, such as secret passages in
medieval castles, designed to allow inhabitants to escape from enemy sieges. Other castles' secret passages led to an underground water source, providing water during prolonged
sieges.
Traditional
Arabic houses sometimes have a "Bab irr": a secret door used as an emergency exit built into the walls and hidden with a window sill or a bookcase. The name comes from one of the six gates cut through an ancient wall in
Aden
Aden ( ar, عدن ' Yemeni: ) is a city, and since 2015, the temporary capital of Yemen, near the eastern approach to the Red Sea (the Gulf of Aden), some east of the strait Bab-el-Mandeb. Its population is approximately 800,000 people. ...
(in modern-day
Yemen), which was opened only in the event of a state security emergency. In modern-day
Spain, the Arab fortress of
Benquerencia has a Bab al-Sirr known as the "Door of Treason."
Other secret passages have sometimes been added after initial building. Secret tunnels have often been created as escape routes from prisons or
prisoner-of-war camps, where they are known as escape tunnels. They typically require a hidden opening or door, and may involve other deceptive construction techniques, such as the creation of a false wall. Other tunnels have been made for different reasons, such as those used for smuggling firearms, illegal drugs and other contraband.
History
There have been many instances throughout history of secret passages and rooms having been used:
Ancient times – AD 1000
Builders of ancient
Egyptian pyramids
The Egyptian pyramids are ancient masonry structures located in Egypt. Sources cite at least 118 identified "Egyptian" pyramids. Approximately 80 pyramids were built within the Kingdom of Kush, now located in the modern country of Sudan. Of ...
used secret passages and
booby trap
A booby trap is a device or setup that is intended to kill, harm or surprise a human or another animal. It is triggered by the presence or actions of the victim and sometimes has some form of bait designed to lure the victim towards it. The trap m ...
s to protect the burial chambers from tomb robbers. In some cases, a secret door to a burial chamber was hidden behind a statue.
Early Christians, who were persecuted by Roman authorities in the 2nd century AD, used hidden rooms to conceal their gatherings for worship.
AD 1000–1600

In 1330,
Roger Mortimer, 1st Earl of March, imprisoned King
Edward II of England in a
coup d'état. A small group of armed supporters of Edward II used a secret passage to attack Mortimer, who was in
Nottingham Castle, defended by several hundred soldiers. The attackers entered through a long, winding secret passage which led directly into the building in which the queen was lodged. An accomplice inside the castle slid back the bolts to the door, which allowed the attackers to arrest Mortimer.
The
Passetto is a passage that links the
Vatican City with
Castel Sant'Angelo
The Mausoleum of Hadrian, usually known as Castel Sant'Angelo (; English: ''Castle of the Holy Angel''), is a towering cylindrical building in Parco Adriano, Rome, Italy. It was initially commissioned by the Roman Emperor Hadrian as a mausol ...
.
Pope Alexander VI
Pope Alexander VI ( it, Alessandro VI, va, Alexandre VI, es, Alejandro VI; born Rodrigo de Borja; ca-valencia, Roderic Llançol i de Borja ; es, Rodrigo Lanzol y de Borja, lang ; 1431 – 18 August 1503) was head of the Catholic Churc ...
crossed it in 1494, when
Charles VIII invaded the city, and
Pope Clement VII escaped to safety through it during the
Sack of Rome, in 1527.
Catholic priests, in
Britain, used hidden rooms called
priest holes to escape
Protestant persecution, starting from the reign of
Queen Elizabeth I.
1600–1900
In the 1730s and 1740s a secret tunnel between
The Olde Bell and the nearby
The Mermaid Inn in
Rye, East Sussex was used by the
Hawkhurst Gang for smuggling.
In 1789, at the outset of what would become the
French Revolution, angry demonstrators in
Paris marched in the streets and stormed the
Bastille. The revolution spread to smaller towns, where tax offices were attacked, and to the French countryside, where peasants attacked rich nobles living in manor houses and castles. Many French royalty and nobles fled to Austria, Russia or Britain. In October, a mob of 7,000 demonstrators marched to the Royal Palace at
Versailles. Although the mob managed to overcome the palace's defences and kill
Marie Antoinette's bodyguard
A bodyguard (or close protection officer/operative) is a type of security guard, government law enforcement officer, or servicemember who protects a person or a group of people — usually witnesses, high-ranking public officials or officers, w ...
s, Marie Antoinette escaped from the palace through a secret passageway.
The
Mikhailovsky Castle is a castle that was built to protect the
Russian Tsar Paul I from assassins. Completed in 1800, the castle's protective features included massive walls and water on all four sides (rivers and canals), with
drawbridge
A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveable ...
s that were raised at night and gun emplacements overlooking the drawbridges. The
Tsar
Tsar ( or ), also spelled ''czar'', ''tzar'', or ''csar'', is a title used by East Slavs, East and South Slavs, South Slavic monarchs. The term is derived from the Latin word ''Caesar (title), caesar'', which was intended to mean "emperor" i ...
also had a secret passageway built into the hallway outside his bedroom to enable him to escape if assailants managed to get past the castle's defences. However, he was never able to use the secret passageway. Forty days after he took up residence in the castle, a group of
co-conspirators
In criminal law, a conspiracy is an agreement between two or more persons to commit a crime at some time in the future. Criminal law in some countries or for some conspiracies may require that at least one overt act be undertaken in furtherance ...
killed him in his bedroom.
During Japan's
Boshin War
The , sometimes known as the Japanese Revolution or Japanese Civil War, was a civil war in Japan fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and a clique seeking to seize political power in the name of the Imperi ...
(1868–1869), the
Emperor's Imperial forces attacked the loyal retainers of the ''
shōgun'' at Aizu Basin. A band of 15- and 16-year-olds loyal to the Shogun, who called themselves the White Tiger Brigade, escaped from Imperial troops using a secret passageway. When the young warriors emerged from the passageway, they saw a burning
samurai residence, which they mistook for the castle. Believing that the castle had fallen to the Imperial troops, the young warriors committed mass-suicide by
seppuku
, sometimes referred to as hara-kiri (, , a native Japanese kun reading), is a form of Japanese ritual suicide by disembowelment. It was originally reserved for samurai in their code of honour but was also practised by other Japanese people ...
(disembowelment), rather than face the dishonor of defeat.
William the
5th Duke of Portland
William John Cavendish-Scott-Bentinck, 5th Duke of Portland (17 September 1800 – 6 December 1879), styled Lord John Bentinck before 1824 and Marquess of Titchfield between 1824 and 1854, was a British Army officer and peer, most remembered for ...
created a network of tunnels on his estate at
Welbeck Abbey, during the 19th century, so that he could enter and leave the property unseen.
1900–present
The Regal Knickerbocker, in
Chicago, Illinois, is a grand 350-room hotel built in the 1920s, during the
U.S. Prohibition era. When the hotel was remodeled in 1980, workers found a secret door in one of the penthouse ballrooms, which leads to a stairway down to ground level. This may have been used to help people engaging in illegal gambling or drinking to escape in the event of a police raid.
During the U.S. Prohibition era, illegal bars, called "
speakeasies", were often concealed behind, above or below seemingly legitimate businesses designed specifically for illicit bootlegging activities. In
Decatur, Illinois
Decatur ( ) is the largest city and the county seat of Macon County in the U.S. state of Illinois, with a population of 70,522 as of the 2020 Census. The city was founded in 1829 and is situated along the Sangamon River and Lake Decatur in Ce ...
, the third floor of Bell's Jewelry Store housed a speakeasy, a
gambling den and a
brothel
A brothel, bordello, ranch, or whorehouse is a place where people engage in sexual activity with prostitutes. However, for legal or cultural reasons, establishments often describe themselves as massage parlors, bars, strip clubs, body rub par ...
, during the 1920s and 1930s. Customers accessed a stairway from the street and entered a sporting goods shop that acted as a "
front
Front may refer to:
Arts, entertainment, and media Films
* ''The Front'' (1943 film), a 1943 Soviet drama film
* '' The Front'', 1976 film
Music
*The Front (band), an American rock band signed to Columbia Records and active in the 1980s and e ...
". After the customers passed through rows of shelves lined with dusty sporting merchandise, a secret panel in the wall was slid open revealing the entrance to the speakeasy and brothel.
In 1928
New York City, Jack Kriendler and Charlie Berns purchased a former
bordello and converted it into a bar and restaurant called the "
21 Club
The 21 Club, often simply 21, was a traditional American cuisine restaurant and former prohibition-era speakeasy, located at 21 West 52nd Street in New York City. Prior to its closure in 2020, the club had been active for 90 years, and it had h ...
." In 1930, they hired architect Frank Buchanan to design a secret door to hide the liquor supply in the cellar, as the place was converting to a speakeasy. To conceal the hidden door from
federal prohibition agents, Buchanan designed the door so that it would appear to be solid concrete wall. The door, which weighed two and a half tons, was supported by massive precision hinges and faced with a concrete slab. The secret door could be opened only by inserting an 18" length of wire through one of several cracks in the concrete.
During World War II, British
Royal Air Force officers held captive in
Colditz Castle built a false wall in the attic of one of the
POW
A prisoner of war (POW) is a person who is held captive by a belligerent power during or immediately after an armed conflict. The earliest recorded usage of the phrase "prisoner of war" dates back to 1610.
Belligerents hold prisoners of war ...
buildings, to hide a workshop where they were constructing a glider to help them escape.
Guerrilla warfare
Guerrilla warfare is a form of irregular warfare in which small groups of combatants, such as paramilitary personnel, armed civilians, or Irregular military, irregulars, use military tactics including ambushes, sabotage, Raid (military), raids ...
fighters have used tunnels and secret passages to attack their enemies without being captured and transport arms and supplies. The
Củ Chi tunnels were used particularly during the
Tết Offensive in the
Vietnam War between 1968 and 1969 by Communist
Vietcong guerillas, who made these inhospitable but sturdy tunnels their home, and transported supplies for the Offensive that were assembled through them. The tunnels contained sleeping chambers, kitchens, classrooms, wells, and medical facilities. In order to maintain the flow of oxygen from the surface, the Vietcong would cleverly disguise air vents as seemingly natural objects like termite mounds. However, the tunnels were far from homey; the Vietcong suffered from many of the elements, such as disease and venomous insects and animals. Particularly nerve-wracking to the Vietcong were the massive aerial bombardment from
B-52 bombers, which could usually cave in portions of the tunnels depending on their depths. Nonetheless, the tunnels stood up to almost everything the American military threw at them.
Recent uses
North Korean tunnels
North Korea has often threatened its
Southern
Southern may refer to:
Businesses
* China Southern Airlines, airline based in Guangzhou, China
* Southern Airways, defunct US airline
* Southern Air, air cargo transportation company based in Norwalk, Connecticut, US
* Southern Airways Express, M ...
counterpart. From 1954, North Korea has been boring tunnels to the South. Up until 1990s only four have been found by the South, but civilian tunnel diggers (남굴사) claim that there are other networks of tunnels under the South. There are reports that the North has exported their skill of boring tunnels to
Hezbollah
Hezbollah (; ar, حزب الله ', , also transliterated Hizbullah or Hizballah, among others) is a Lebanese Shia Islamist political party and militant group, led by its Secretary-General Hassan Nasrallah since 1992. Hezbollah's parami ...
in
Lebanon and
Hamas in the
Gaza strip
The Gaza Strip (;The New Oxford Dictionary of English (1998) – p.761 "Gaza Strip /'gɑːzə/ a strip of territory under the control of the Palestinian National Authority and Hamas, on the SE Mediterranean coast including the town of Gaza.. ...
. Swedish journalist
Bertil Lintner has provided pictures of North Koreans helping the tunnel boring in Myanmar. He is considered the first journalist to reveal the growing relationship between Myanmar and North Korea on strategic cooperation. He has stated that in the 1970s, Sweden exported
tunnel boring machines of Atlas Copco Corp. to North Korea.
Four North Korean tunnels have been discovered. The first tunnel (제1땅굴), was found in 1974 in JangnamMyun YeonCheonKun, Kyungki Province; and the second tunnel (제2땅굴) was found in 1975 in KeodongMyun, ChulwonKun, Kangwon Province. The third tunnel (제3땅굴) was found in 1978 in ChangdanMyung, Paju City, Kyungki Province. This one is close to the capital,
Seoul and extended beyond the DMZ over 400 meters. The fourth tunnel (제4땅굴) was found in 1990, in HaeanMyun, YangkuKun, Kangwon Province.
Palestinian tunnels
Hamas and
Islamic Jihad have built tunnels across the border between the
Gaza Strip
The Gaza Strip (;The New Oxford Dictionary of English (1998) – p.761 "Gaza Strip /'gɑːzə/ a strip of territory under the control of the Palestinian National Authority and Hamas, on the SE Mediterranean coast including the town of Gaza.. ...
and
Israel in order to enter Israel secretly, carry out attacks and capture hostages, and return unseen to the Gaza strip.
Smuggling
On 25 January 2006 a
smuggling tunnel that crossed under the border of the
United States and
Mexico was discovered. It was used to transport vast quantities of
cannabis from
Tijuana into
Otay, California
Otay Mesa ( ) is a community in the southern section of the city of San Diego, just north of the U.S.–Mexico border.
It is bordered by the Otay River Valley and the city of Chula Vista on the north; Interstate 805 and the neighborhoods of Oc ...
, for U.S. consumption. It linked two industrial warehouses and was ventilated and well lit. It, and other tunnels, have also been used for
illegal immigration
Illegal immigration is the migration of people into a country in violation of the immigration laws of that country or the continued residence without the legal right to live in that country. Illegal immigration tends to be financially upwar ...
.
Between August 2000 and May 2002 more than 1,000 ancient books went missing from the library of the
monastery of Mont Sainte-Odile. Stanislas Gosse stole the books after finding an old map showing a secret entrance into the library. The route was not easy, however, involving climbing up exterior walls, a steep staircase and a secret chamber. A mechanism then opened the back of one of five cupboards. The disappearance of so many books over such a length of time confused the librarian, the monks and the police. Gosse was finally caught after he was observed on
closed-circuit television
Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly t ...
.
Residential "panic rooms"
A small number of contractors in the US and UK specialize in the construction of hidden doors and fortified secret rooms for private residences. These rooms, known as "panic rooms" or "safe rooms", are hidden, secure spaces designed to protect inhabitants in the case of a break-in or
home invasion
A home invasion, also called a hot prowl burglary, is a sub-type of burglary (or in some jurisdictions, a separately defined crime) in which an offender unlawfully enters into a building residence while the occupants are inside. The overarching ...
.
The fortified doors and walls protect the occupants so they can summon help using a mobile or land-line phone. Doors and walls can be reinforced with
steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
,
Kevlar,
sound-proof or bullet-resistant
fiberglass panels. The door to the safe room can be concealed by panels that match existing walls or doors in the home.
Mythological and fictional uses
Secret passages are used as a
plot element or as part of the setting in mythological stories, fiction, and in television programs or films. Secret passages in old buildings, castles,
haunted houses, and the lairs of villains or superheroes enable characters to secretly enter or exit the building, access a hidden part of the structure, or enter a supernatural realm. These passageways are often opened by pulling a disguised lever or lock mechanism. In some cases, a certain book on a bookshelf serves as the hidden trigger for the mechanism.
Mythological uses
In Greek mythology,
Hyrieus, the King of
Boeotia, hired
Trophonius and
Agamedes to build a
treasure chamber for him. However, the pair built in a secret entrance and stole his fortune.
Detective and mystery stories
In the late 1890s, detective novels featuring seemingly "impossible crimes" became popular. Impossible crimes were sometimes carried out using secret passages or doors. Subsequent generations of detective pulp fiction and mystery story authors also used the plot device of secret passages.
However, the use of secret passages in detective fiction and mystery stories has been criticised, on the grounds that it is not "fair" to expect the reader to guess about the existence of these secret passages.
Ronald Knox (1888–1957), a British theologian and detective story author, argued that the plot device of a secret passage was overused in detective fiction. Knox's ''Ten Commandments for Detective Fiction'' states that "Not more than one secret room or passage is allowable." Furthermore, Knox urges that secret passages not be used in detective stories unless the story takes place in an old house or castle where a reader might reasonably expect to find a secret door or passageway.
Carolyn Wells
Carolyn Wells (June 18, 1862 — March 26, 1942) was an American mystery author.
Life and career
Born in Rahway, New Jersey, she was the daughter of William E. and Anna Wells.
After finishing school she worked as a librarian for the Rahway Li ...
' "impossible crime" stories from the first decades of the 20th century, such as ''Faulkner's Folly'' (1917) are often set in an
upper class country house
An English country house is a large house or mansion in the English countryside. Such houses were often owned by individuals who also owned a town house. This allowed them to spend time in the country and in the city—hence, for these peopl ...
, where a murder takes place. There is a
closed circle of suspects, all linked to the murdered man; however, based on the layout of the house, the murder seems "impossible". In Wells' stories, the solution to the seemingly impossible crime plots tend to depend on the murderers' use of secret passageways, secret panels, and hidden doors.
Passages figure in several books of the ''
Famous Five'' series written by
Enid Blyton.
Many of the supposedly haunted locations the main characters explore in the ''
Scooby-Doo'' children's cartoon franchise have secret passageways, tunnels, and halls.
Various secret passages have been depicted in
Batman
Batman is a superhero appearing in American comic books published by DC Comics. The character was created by artist Bob Kane and writer Bill Finger, and debuted in Detective Comics 27, the 27th issue of the comic book ''Detective Comics'' on ...
fiction, usually one between
Wayne Manor and
The Batcave
The Batcave is a subterranean location appearing in American comic books published by DC Comics. It is the headquarters of the superhero Batman, whose secret identity is Bruce Wayne and his List of Batman supporting characters#Bat-Family, part ...
and another for the
Batmobile to enter/exit the Batcave.
In the
Harry Potter
''Harry Potter'' is a series of seven fantasy literature, fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young Magician (fantasy), wizard, Harry Potter (character), Harry Potter, and his friends ...
series by
J.K. Rowling, the ancient castle school of
Hogwarts (where much of the action takes place) contains numerous secret and magical passages hidden behind paintings, statuary, and furniture.
Games
In
role-playing game
A role-playing game (sometimes spelled roleplaying game, RPG) is a game in which players assume the roles of player character, characters in a fictional Setting (narrative), setting. Players take responsibility for acting out these roles within ...
s, secret passages, like traps, can be found in all sorts of buildings, especially in
dungeons and castles in
high fantasy role-playing games. The mansion in the board game ''
Cluedo'' (''Clue'') has two secret passages that players can use to move to an opposite corner of the board.
Video games often feature hidden areas, sometimes as an important part of the game and other times as an
Easter egg. Such areas can be a required route in order to continue or may be optional and contain rewards for the player, such as a
bonus stage, a
secret character, extra items or a shortcut to a later part of the game. Some secret entrances are invisible, such as a normal-looking wall that can be walked through, while others give a slight visual clue, such as a cave behind a waterfall.
See also
Parent categories:
*
Rock-cut architecture
*
Subterranea (geography)
Subterranea are ''underground structures'', both natural (such as caves) and human-made (such as Mining, mines). Some subterranea and related topics include:
Natural
* Caves
** Cenote
** Ice cave
** Sea cave
** Sinkhole
* Karst
* Lava tube
** ...
: underground structures
*
Underground city, umbrella article for underground dwellings and facilities
*
Underground living
Secret rooms and passages:
*
Ley tunnel
*
Priest hole
*
Smuggling tunnel
*
Tunnels in popular culture
*
Metro-2
Notes
# (27 January 2006)
Drug haul in secret border tunnel at
BBC News. Accessed 28 January 2006.
# (19 June 2003)
Mystery at the monastery ends as CCTV reveals chamber of secrets' daring thief at ''
The Guardian''. Accessed 30 January 2006.
References
{{DEFAULTSORT:Secret Passage
Types of secret places
Doors
Rooms
Deception