Abandoned bridge hidden deep in the San Gabriel Mountains.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Surreal riveted sea forts once protected the Kent shores from German attack.

An unassuming secret door once led to a legendary watering hole.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A picture-perfect town, perfect for blowing up.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

All that's left of the quintessential "cabin in the woods."

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A Hawaiian stairway to heaven—that you can't climb.

Less a museum than a bizarre fantasy world created by artists and engineers.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

An abandoned stretch of highway, deteriorating next to the operational one.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

More gold than anywhere else, ever.

The longest hedge maze in the world.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Once the most densely populated place in the world, this island is now a ghost town.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.