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

The spot where the two men ate together now stands enclosed in glass.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

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

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

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

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

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

With over 12,000 different species of plants, this botanical garden is Japan's oldest and most diverse.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

Watch butterflies take flight before you fly.

Across this single-file rope bridge is what has been claimed to be the edge of continental Asia.

The only castle in North America to ever house European sovereigns.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.