Rippling sand dunes frozen in the Arizona rock.

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

World's largest collection of serial killer artwork and other macabre exhibits.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

Sleep in a glass pod dangling off a cliff.

An unexpected desert oasis in South America.

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

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

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

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

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

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

This "cursed house" features secret rooms, hidden vaults, and dark escape tunnels.

These enigmatic columns tower over the ruins of an ancient Toltec city.

Beach instrument turned bed and breakfast.

The development of this cliffside waterpark is representative of Mexico's history of co-op tourism developments.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

The stoutest tree in the world.

This extraordinary art museum is like a secret world on the edge of Mexico City.