This unimaginably large pile of sand near Nazca is one of the tallest dunes in the world.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The atmospheric road was never meant to be so creepy.

These fantastically named natural pools look like something out of a Scottish myth.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

A Spanish forest is filled with mysterious stone carvings.

An isolated village literally built into the crevices and rock formations of a mountain.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Lunar landscape, a mud volcano and bizarre rock formations.

Massive fortress bastions in the desert of Cholistan.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

This lost city belongs to one of the earliest civilizations in the world.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

When ecosystems collide in the arid Southwest.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

Native Americans built this circle of stones, which was used to predict astronomical events.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.