Veryovkina Cave is more than 1.3 miles deep—the deepest known in the world.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Dedicated to improving the plight of the rare scaly anteater.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

This unique formation is characterized by hexagonal basalt rocks stacked in unique formations.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

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

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

An extravagant monument to an extravagantly unpopular Emperor.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This temple contains what might be the world's oldest optical illusion.

This women-run eatery and cooking school is putting India's long-neglected tribal cuisines back on the menu.

The Kaveri River cuts through the rocky terrain then drops off to form these misty falls.

A giant repository of accidentally discovered cave paintings up to 30,000 years old.

Buddhist monk remarkably preserved because he started the mummification process while still living.

World's tallest monolithic statue has served as a pilgrimage site since its completion in 993 CE.

An architectural marvel that dates back to the zenith of Indian architecture.