A large visitor's complex and place of remembrance on the outskirts of the DMZ.

South Korea's largely symbolic, barely used gateway to the North.

The best place for scenic views of the DMZ and North Korea.

Secret North Korean passage discovered below the world's most dangerous border.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

A former factory serves as a shrine to the industry that sustained Santorini for decades.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

This abandoned Greek island was the last active leper colony in Europe.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

This 17th-century structure is a beautiful testimony to traditional Persian architecture

Marked by the hand of the explorer Henry Morton Stanley.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

The palace of the King of Kings, burned by Alexander the Great.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

A dreamy mausoleum honors Persia's most famous poet.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

With over 10,000 lights, this engineering marvel lights up the city after dark.