Fat Margaret (, ) is a tower in

Tallinn Tallinn is the capital city, capital and List of cities in Estonia, most populous city of Estonia. Situated on a Tallinn Bay, bay in north Estonia, on the shore of the Gulf of Finland of the Baltic Sea, it has a population of (as of 2025) and ...

, Estonia. Nowadays, the tower is home to

Estonian Maritime Museum The Estonian Maritime Museum () is located in the Fat Margaret tower in the old town of Tallinn. The museum presents the history of ships and navigation in Estonia and related to Estonia. Other parts of the Maritime Museum are the mine museum ...

. The tower was built in the early 16th century (from 1511 to 1530) during the reconstruction of the medieval city gate system. The etymology of the tower's name derives from the fact that it was the largest part of the city's fortifications with walls measuring 25 meters in diameter, 20 meters in height and up to 5 meters thick. Apart from being a fortification against would-be invaders to the port of the town, it was also built to impress outside visitors arriving by sea. The tower is a defensive structure at the end of ''Pikk tänav'' (Pikk Street). Together with the ''Suur Rannavärav'' (Great Coastal Gate), a sixteenth-century arch flanked by two towers, it served to defend the harbour of

. Later, it was used as a storehouse for gunpowder and weapons, and then transformed into a prison, and was the scene of an outbreak of violence during the 1917 Revolution, when the prison guards were murdered by a mob of workers, soldiers and sailors. In the 1920s there were plans to convert it into an artists' home. The tower was reconstructed from 1978 to 1981 to house the Maritime Museum.

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Towers completed in the 16th century Buildings and structures completed in 1530 Tallinn Prisons in Estonia Tallinn Old Town {{Tallinn-stub