Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

A bizarre house filled with an astounding array of collections.

Sleep in a glass pod dangling off a cliff.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

A one-of-a-kind collection of a unique medium.

A quiet memorial to those who died saving others in the heart of the City of London.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

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

Centuries-old bridges grown from tangled roots.

Once the most densely populated place in the world, this island is now a ghost town.

The world’s first hotel to be run by robots.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

This semi-hidden Manhattan restaurant is based out of a loading dock.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

The latest in a series of long glass bridges suspended at terrifying heights.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.