Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A park full of outsider art, created by college students studying outsider art.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

A toxic ghost town sitting atop a massive coal fire.

This Great Depression-era creation was once known as the strangest house in the world.

This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

Century-old shop, specializing in Occult products.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

One of Philadelphia's largest murals resides hidden under this bridge.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

The abandoned coal loading dock is a canvas for unsanctioned art.

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

An allegedly cursed tree represents a town's reckoning with a racist past.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.