The best way to experience the convivial fortified city of Muiden is to take a stroll by the harbour with its many traditional sailing boats or to settle down at an outdoor café with a view of the Groote Zeesluis. Alternatively, you can explore the fort island of Pampus or visit the centuries-old Amsterdam Castle Muiderslot. Along with Naarden and Weesp, the fortified city of Muiden played an important role. Muiden closed off the Zeedijk dyke and protected the sea and inundation locks of the Vecht. Fort C, also popularly known as ‘the Muizenfort’, has a small museum about the New Dutch Waterline and the Defence Line of Amsterdam.