Tubing through a cave lit with glowworms is a magical underground experience.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

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

A battle between nature and architecture in the Cambodian jungle.

The wartime prison now features haunting sculpted reenactments of the atrocities that took place there.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

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

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Climb to the top of the world's largest seated bronze Buddha.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

A harrowing trail up a mile-high mountain.

This probably wasn't what Mao had in mind.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

This Tang Dynasty behemoth is the biggest Buddha in the world.

Why walk on this historical site when you can zoom down instead?

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.