An abandoned Incan construction project left behind a mysterious "doorway."

Pre-Incan aqueduct amidst a stone forest in Peru.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

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

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.