A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Once the path of a railway tunnel, now home to thousands of glowing insects.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This charmingly homemade amusement park has been growing for 40 years.

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

An emporium for the weird, creepy, rare, and just plain gross.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Final resting place of two dozen New York City harbor ships.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

A fake town founded by Western movie stars is now becoming a hip desert community.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

Former villa and estate of James Deering developed to preserve native tropical forests.

A local prank turned town icon.

The whole world in one water tank.

A small Richmond island dotted with the remnants of hundreds of years of history.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Settled in 1696, abandoned after the Revolutionary War.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

This Florida arena, once host to "the fastest game in the world," has sat empty for 25 years.

This picturesque ghost town is located on the banks of the Suwannee River.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.