The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Burial site of the world's most widely known researcher on the endangered mountain gorilla.

A small Rwandan workshop where you'll find traditional works of art—made from cow dung.

The clever workshop that has been designing some of the most unusual coffins imaginable.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

Sacred Buddhist home of some spiritual monkeys.

Named after the Goddess of Harvests, Annapurna is the deadliest member of the Eight-thousanders club.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

Made by a man on a worldwide sanitation crusade.

A blooming house of worship for the masses.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

The oldest teak bridge in the world is made from the remains of a royal palace.

A grand imperial capital left to fall into magnificent ruin.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

A series of tiny artificial islands rich with produce bob atop the surface of the lake.

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

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

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