Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A fascist-era rural village abandoned since the early 1980s.

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

The ruined remains of a coal mining ghost town are hidden within the woods.

A glittering Thai Buddhist temple in suburban Pennsylvania.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

The graffitied ruins stand hidden within the Pennsylvania woods.

This public space is speckled with the eerie remnants of a defunct amusement park.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

Where the "World Pinball Champion” is crowned.

A retrofuturistic art installation in the Pittsburgh Airport.

This dramatic rail curve was once the target of a failed Nazi attack.

Steepest flood safety railway in the entire world.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

These disused steel furnaces are now haunting ruins that may one day be a national park.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.