An abandoned railroad tunnel is now filled with bioluminescent bugs.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

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

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

The world's largest clay lick, where parrots gather to snack.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Once considered a marvel of engineering, there are now doubts about the structural integrity of this 5.4-mile cable-stayed bridge.

This everlasting lightning storm may be the world's largest generator of ozone.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Sleep in a glass pod dangling off a cliff.

An unexpected desert oasis in South America.

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.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

A remarkable geological formation resembling a forest made of stone.

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

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.