FAST FACT: 142-foot-high brick tower resembles a smokestack, but it was used to make musket balls from 1808 to 1903. Molten lead was poured from the tower top, and when it hit the water at the bottom it had formed into perfectly round balls.
Fun reads:
From Musket Balls to Basket Balls, The Philly History Blog, January 25, 2008