Stunning examples of Russia's 18th-century wooden architecture.

Monastery, army base, and infamous Soviet Gulag in the far Russian north.

Natural arch offers panoramic views of Yangshuo's karst hills.

Enormous burial mounds of ancient emperors.

Bridge that died in war and was resurected.

Controversial site of what could be Europe's first pyramid.

Oriental bazaar in the heart of Sarajevo.

One of the most ethnically diverse spots on the planet.

Final palace complex of the last of 29 Kokand rulers.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Light still pours into the ruins of this ancient Islamic observatory.

An 18-meter-long sarcophagus of a constantly growing dead prophet.

The Avenue of Mausolea is a series of grand palatial tombs.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Massive volcano in the Andes is the farthest point from earth's center.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Frida Kahlo's childhood home, now a museum of her life and works.

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

Mexico's astounding mummy museum with "the world's smallest mummy."

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

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