A million and a half tons of earth were used to create one of the world's largest land sculptures.

Houses are tucked between, on, and underneath giant boulders.

An autonomous republic of Orthodox monks.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

Retirement home for giant obsolete machines.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Centuries-old bridges grown from tangled roots.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

The remains of diamond fever taken over by the desert.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

The atmospheric road was never meant to be so creepy.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

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