An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

A spherical "micro-nation" in the heart of Vienna.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The remnants of an early American attempt at missile defense.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

One man's artistic vision is a small town government's legal battle.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

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

A self-built castle made by a mysterious man.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.

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

A harrowing trail up a mile-high mountain.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

A vertically floating hemlock controls the waves and weather at Crater Lake.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

An autonomous republic of Orthodox monks.

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

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.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

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

Secret Soviet city once home to Russian cosmonauts and space training facilities.