The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Taiwan's last Chinese character letterpress preserves the dying art of Chinese character mold making.

This densely-packed cluster of buildings was saved from the wrecking ball and turned into an art community.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

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

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

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

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

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

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

This historic spot was where America's involvement in the Vietnam War officially came to an end.

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

This 700-year-old street food market features baby octopus and soy donuts.

A man-made island designed to look like a massive battleship.

A magically clear, blue river that seems to spring from nowhere.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

The remains of an abandoned air force hospital located on a redeveloped Air Force base.

A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

After being bombed and largely abandoned, this former railway workshop has been transformed into a lively market space.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.