A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

This oddly named town refuses to change its phallic moniker.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The United States Capitol's former columns still stand.

An eerie, decaying ghost town destined to fade into the forest.

A derelict bit of transportation infrastructure hidden in the woods.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

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

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

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

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

This general store is a one-stop-shop for workers at the Prudhoe Bay oil field.

This artful dam holds back a crater-made reservoir that can be seen from space.

This underground power plant looks more like a super-villian's lair than a public work.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

One car at a time please.