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

A giant, bloody battle rages throughout the Bolivian Andes each year.

Mystic Incan rock piles three miles above sea level.

Historic psychiatric asylum and most-filmed location in the Great White North.

Stroll through a wonderland of stupendous moss-covered trees.

Sacred Buddhist home of some spiritual monkeys.

Last stop before the top of the highest peak in the world.

Miraculous vase predicts the future at this Tibetan Buddhist site in the Himalayas.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

A harrowing trail up a mile-high mountain.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

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

Hindu temple of the dead home to hundreds of long-tailed macaques.

A natural arch offers panoramic views of Yangshuo's karst hills.

Snow-capped peaks, colorful waterfalls and stunning vistas on the edge of the Himalayas.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

A fiery crater has been burning in the Karakum Desert since 1971.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Built to hold the worst of the worst of the Nazi war prisoners.

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