In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Dramatic river bend surrounds a natural red-rocked pedestal.

World's first "penitentiary," meant to be humane, drove men insane.

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

Khmer Rouge's high security prison.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

A quick and simple solution to Cambodia's train woes.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

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

These azure waters were thought to lead to the Mayan Underworld.

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

This Himalayan airport provides one of the most difficult landings in the world.

This penis-focused monastery is dedicated to Buddhism's "Divine Madman."

This giant Buddha statue has 125,000 smaller Buddhas hidden inside it.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

Legend has it a commoner volunteered to be buried alive in the foundation so that the great fortress could be built.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

There are millions of temples in India, but only one prominent temple dedicated to the Hindu creator god.