Hear the quietest sound from across the dome.

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

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

This holy site either displays a centuries-old cross or a complete fake.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

Bohol's mysterious brown hills.

A tall karst islet popularized by 007.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.

These crumbling towers are some of the last remnants of a centuries-old Vietnamese culture.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

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.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Macabre astrological automaton clock dating to the late 1400s.