On the eastern edge of the Old Town is the best surviving bastion from the original city walls. You can take a group walking tour (in Polish only, though English text is available) through the renovated fortifications and casemates, checking out displays of military gear and views over the city. Tours leave on the hour from 9am to 6pm May to October, and to 3pm November to March. The street is lined with market stalls, and tickets are sold from market stall number 28.
