Built at the geographical center of William Penn's original plan for Philadelphia, this building was nothing short of a masterpiece when it was completed in 1901. From the six-story spiral staircases to the immense chandeliers that illuminate the mosaic floors, it remains the largest city hall in the country, with nearly 700 rooms. The exterior is also rich with sculptures by Alexander Milne Calder, including the monumental statue of Penn that stands on top. The building affords a terrific view of the city. An elevator makes the ascent to the top of the tower every 15 minutes Monday-Friday 9:30 am-4:15 pm. Tours of the interior are available Monday-Friday at 12:30 pm. Tours are free, but donations are accepted. Broad and Market streets, Philadelphia. Phone 215-686-2840.