The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Frida Kahlo's childhood home, now a museum of her life and works.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Extraordinary sculpture garden created by an eccentric English poet.

A gargantuan crystal kingdom.

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

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

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

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

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.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

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

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

Extraordinary rock formations in open Peruvian fields.

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.

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

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

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

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

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