A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Mysterious rocks that ring musically when struck.

Step inside Lucy, the world's largest "elephant."

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Ancient Peruvian fertility temple or modern money-making hoax? Either way these monoliths still look like penises.

A field of nothing but boulders which resembles a giant's gravel driveway.

This tiny patch of arid sand sits in one of the greenest states in the United States.

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

An unexpected desert oasis in South America.

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

Death rituals and sacrifice inside a Peruvian megalith.

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

The Uros people live on floating reed islands in lake Titicaca.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.