This storybook New England home is actually a decommissioned lighthouse.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

This enormous sinkhole hides a secret world created from divine wrath.

This long-abandoned village sits across a narrow gorge from a still-inhabited settlement that was once its twin.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A lonely beacon, precariously perched atop a remote sliver of rock.

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Réunion Island's highest point is a 2 million-year-old volcano and a paraglider's paradise.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

There's an exclusive Beefeaters pub hidden in the Tower of London.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

This "floating island" plateau sits 7,671 feet above the forest floor.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

Centuries-old bridges grown from tangled roots.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The birthplace of the very first human resident born in Antarctica.