This small, seasonal 'museum' (open from April until the end of October only) is in turns uninformative and overly informative, but basically it gives you a chance to climb around what's left of Kraków's 13th century defensive walls. Pass a few silly mannequins in medieval dress and watch a strange video before walking the length of wall between the city's only three surviving towers, while learning about the other 40-odd towers demolished by the Austrians in the 18th century. Enjoy views and great photo opportunities over Floriańska Street, but generally a visit to the Barbican is more interesting and informative; fortunately your ticket includes entry to the Barbican as well.