In this historic region, homes and churches are carved into ancient volcanic rock formations.

The most famous location in China was home to whole dynasties worth of imperial rulers.

China's beehive-shaped pyramids house the remains of a lost kingdom.

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

17th century mosque for Shah Abbas' harem.

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

A city built from mud and known as the "Manhattan of the desert."

The most alien-looking place on Earth.

Skyscraper powered by wind turbines attached between its towers.

Ancient and modern architecture are joined in Louis Kahn's monument to democracy.

Quite possibly the last cross all humans will ever see.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Morocco's Argania trees are infested with nut-hungry goats.

Morocco's largest Jewish cemetery.

Over 4,700 miles of trees being planted to hold back the desert.

The world's largest ship graveyard is the product of decades of corruption.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A valley of unique erosion patterns lends to a view like nothing on Earth.