This crumbling stump is all that remains of what was once thought to be the oldest living organism.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Metal water storage tank turned ethereal concert hall.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

A small flooded ghost town with a few scattered structures remaining.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

Jurassic Park—A Still Life.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A miraculous natural phenomenon known as "the spring that breathes."

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

The drama of nature in full effect in this Nevada State Park.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Are these prehistoric metal pipes evidence of alien plumbers? Nope, but they are amazing nonetheless.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

China's very own Atlantis is an ornate dynastic city resting at the bottom of a lake.