The oldest surviving presidential residence in the United States.

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

A completely round house designed for the Atomic Age.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

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

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

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

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

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

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

This quaint New Jersey graveyard is an eternal resting place for thousands of beloved pets.

A hidden beach at the end of a tunnel of mangrove trees.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.