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

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

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

A colorful Peruvian city of the dead.

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

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

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

Extraordinary rock formations in open Peruvian fields.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

White llama terraces dazzle in Peru's "other Machu Picchu."

Death rituals and sacrifice inside a Peruvian megalith.

The Uros people live on floating reed islands in lake Titicaca.

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

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

An unexpected desert oasis in South America.

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

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.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

A market for witches is hidden within a train station.

A remarkable geological formation resembling a forest made of stone.

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.