The Kiek in de Kök Fortification Museum is a 500-meter-long complex featuring four historic towers: Kiek in de Kök, Maiden’s Tower, Tallitorn, and the Short Leg Gate Tower. The museum also includes mysterious underground passages housing the Carved Stone Museum. The Kiek in de Kök exhibition provides an overview of historic warfare, while the 17th–18th-century bastion passages highlight the history of fortifications and key military events. Visitors can explore the bastion passages and Carved Stone Museum with an audio guide, which should be downloaded to their phone in advance.