A "hospital" where people went to be quarantined, die, and be buried in the yard.

Rotting dome home spotted near Chapel Hill, North Carolina.

This woodland architectural installation acts as a camera obscura for the heavens.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A toxic ghost town sitting atop a massive coal fire.

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

Where America's first doomsday cult awaited the end of the world.

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

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This maximum-security prison was abandoned to make way for a national park.

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

Yo, Adrian!

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

A daily replay of the experiment that proved the rotation of the Earth.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

A rare view of a preserved Victorian science museum.

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.