A unique underground structure dating back to the 1st century BC.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Walk through living pictures and music in the Cathedral of Images.

Unique house covered in a nightmarish mural of demons, ghosts and monsters.

The rusted creatures wait to be discovered in Prague's botanical garden.

One of the oldest, well-preserved water treatment facilities in all of Europe.

Monument to a suicide protesting the Soviet invasion.

An Orwellian sculpture with eyeball cameras watches passersby.

A beautifully eclectic mix of architectural styles.

A saintly relic hidden in a Prague church basement.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This doorless 20th-century elevator doesn't stop or slow down.

This ambiguous pig shrine is actually a monument to a beloved queen.

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

An extravagant monument to an extravagantly unpopular Emperor.

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

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.

A gift from the Soviet Union in the 1980s, this is the only statue of the Soviet dictator in Southeast Asia.

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

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

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

These relics of the city's past now exist as a prominent modern feature.