Kiek in de Kök, Bastion Passages, the Carved Stone Museum, Maiden's Tower, Marstal Tower and the Short Leg Gate Tower make up a massive museum complex over 300 metres long. Kiek in de Kök tower is an excellent introduction to the history of Tallinn's defences. Built 1475 - 1481, the 45-metre, six-storey cannon tower played a key role in the Livonian War and still has nine of Ivan IV's cannonballs embedded in its walls. And where did the tower get its name? Medieval soldiers joked that from its top, they could see right into the kitchens of the houses below - hence the odd name. Legends, secrets and underground tunnels, the Bastion Passages aren’t just for rats any more. Built in the 17th-century by the Swedes to help protect the city, these passages are a fascinating relic of times past. The Carved Stone Museum, housed in the same passages, displays decorative and interesting carved stone fragments, including columns and family crests dating back to the 15th century. Originally erected in 1370-73, the Maiden's Tower has undergone extensive renovations and it’s been reconnected to the adjacent defence tower, the Marstal Tower. Maiden's Tower features historical exhibits reflecting these fortifications and the stories that go along with them.