This is one of the most iconic structures in the U.S., located in the heart of Philly. The 24-foot thick walls hold 4 acres of space and there's a 53,000-pound sculpture of William Penn up top. Known better for his artistic mobiles, who designed the 36-foot Penn statue?

Calder was an American sculptor best known for his kinetic sculptures powered by motors or air currents. You can find them in some of our country's most populated cities and in the finest museums. A native of nearby Lawnton, PA, Calder was an obvious choice to commemorate the namesake of his home state.

Asked by Tom Cohen · Last updated 5 years ago · 5.6K views