This methodist cemetery is slowly receding into the wilderness along a Maryland highway.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

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

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A historic neighborhood church is reborn as a psychedelic arts collective.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The rogue roots are gradually consuming some of the historic marble grave markers.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This abandoned amusement park was built on a site with a dark history.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

Outsider art meets paleontology at this roadside reptile repository.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.