Huge masonic hall in Philadelphia with lavishly themed rooms.

The first American department store, and home to the largest operating musical instrument in the world.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

In the early 1800s, surgery was also a show.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

An Irish Memorial commemorating those who perished due to potato blight.