One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

A forsaken wonder in the middle of the East Side neighborhood.

A self-built castle made by a mysterious man.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

An Australian lake whose pink hue defies scientific explanation.

The site of the climactic scene from the classic horror film is now a historic landmark.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Yo, Adrian!

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

This Costa Rican chapel is the most metal church in the world, literally.

Costa Rican accommodation resembles a crash site, but with a nice balcony.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

Terrifying derelict military hospital once housed a recuperating Hitler.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

A secret climbing tree hides along the side of a Costa Rican road.