Fat Margaret's Tower

Fat Margaret is a tower in Tallinn, Estonia. Nowadays, the tower is home to Estonian Maritime Museum.

The tower was built in the early 16th century 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. Together with the Suur Rannavärav, a sixteenth-century arch flanked by two towers, it served to defend the harbour of Tallinn.