One of the world's largest shopping malls covers an area of 15 million square feet—and it's still set to grow.

Modern museum, designed for Jihadi tourists.

After this one-of-a-kind palace was built the architect's hands are said to have been cut off to keep it that way.

The largest hewn stone in history.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

A huge museum of much more than just agriculture displayed in a princess's palace.

This massive subterranean fissure is known as the "underground Grand Canyon."

The remains of what was, not so long ago, the world's largest city.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

One of the world's last well-maintained airship hangars.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

The enigmatic and seldom visited ruins of a Mayan city-state.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.