Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This elaborate towering structure was once famed for its revolutionary height.

This beloved marketplace mascot poops money and grants good luck.

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

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

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

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Thomas Edison's home and final resting place also boasts an impressive garage, where some of the earliest electric cars are on display.

Take a step into the workshop where Edison and his employees revolutionized the world.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

Step inside Lucy, the world's largest "elephant."

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

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

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

Alexander Hamilton’s creation caused quite a bit of controversy.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

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

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