Geometry and mystery come together in an epic show of octagonal masonry.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

An endless sea of white conical domes.

An entertainment center in a huge transparent tent.

The largest stone moai on Rapa Nui.

This famous city eluded concrete detection until the early 2000's.

Temple complex that once housed the famous statue of Nike.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

A deadly ancient portal to the underworld.

The rocky remains of an ancient Greek forest.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A battle between nature and architecture in the Cambodian jungle.

The quintessential Japanese rock garden has existed for more than 500 years.

Visit this playground of waterfalls, caves and sinkholes.

Enchanting cave with a river crashing through the roof.

Italian cave with exceptional acoustics and an unsavory history.

These azure waters were thought to lead to the Mayan Underworld.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

This legendary city has been a tourist attraction for centuries.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Water and windows define this defensive Italian well.

A gallery of underwater art that can be visited by man and fish alike.

A living art gallery painted on a canvas of Monterey pine trees.