Human ancestor’s 3.6 million year-old footprints.

Monastery, army base, and infamous Soviet Gulag in the far Russian north.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The encased skull that is widely believed to belong to St. John the Baptist.

The fairy tale castle of the "fairy-tale king."

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

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Home to some of the oldest hominid fossils ever found.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Historic medieval fortified city in southwest France.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Columbus' failed colony in the New World.

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

Ancient Greek oracle of the dead.

Underground monastery and fortress.

Roman-era ships unearthed...

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Ruins of the Crusaders' headquarters.

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

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

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

A church that bred legends, and served as an inspiration for the Da Vinci Code.