One of Poland's largest and most awe-inspiring town halls, it was originally built in the late 13th century but has been added to and renovated time and again over the centuries. Surprisingly, it survived World War II and now lends an immense amount of character to the town square. It has lost its administrative function and now serves a mostly decorative role -- a place to situate a huge tower and hang an astronomical clock. The city museum inside is worth a quick peek, but more to see the inside of the building than to peruse the exhibits at length. After you've toured the building, have a meal and a cold one at one of the city's best beer halls, conveniently located in the Town Hall basement.