Mysterious hillside with a continuously burning natural fire.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

A gigantic collection of teeny, tiny books.

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

Heavily bombed during the Vietnam War, this small town turns unexploded munitions into utensils.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

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.

One of the most ethnically diverse spots on the planet.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Lonely minaret stump of a destroyed city.

Be careful not to get trampled at this lively two thousand-year-old market.

Natives of this mud-brick desert village use an ancient irrigation system to grow sweet, seedless grapes.

The ancient remains of this natural fortress can still be found along the Silk Road looking surprisingly preserved.

A lush desert oasis in the shape of a narrow crescent.

Museum dedicated to the terror regimes of Hungary.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

Intensely colorful calcite pools in Southern China.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

An ancient stone fortress considered by many to be the eighth wonder of the world.