Stone Age solar temple is aligned with the sun on each equinox and solstice.

The underground sanctuary of a mysterious ancient cult.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Mysterious Spanish catacombs of unknown origins.

Commonly acknowledged as the only public monument to the Devil himself.

The earliest known map to show America, discovered by accident at a Paris bookshop.

An ancient Egyptian temple in the middle of Madrid, Spain.

These serpents are considered holy and pampered accordingly.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The largest earthwork effigy in the world.

The ancient tomb acts as a calendar that keeps perfect time.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

An underground city of salt.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.