This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

This railroad tunnel was once the longest in Massachusetts.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The oldest continuously occupied public building in the United States.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A sprawling collection of over 106,000 toys from around the world.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

This mountaintop refuge rehabilitates tigers, lions, bears, and more from illicit wildlife trade—and offers overnight lodging.

The site where Sakyamuni Buddha first met his father after achieving enlightenment.

Designed to honor the birthplace of Buddha.

Siddhartha Gautama sat here and received enlightenment.

A bulky, ancient stupa marks the site of Siddhartha Gautama's seminal Buddhist teaching.

The octagonal tower at this important Buddhist site was added many years after the temple's initial construction.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

The last remaining attraction from Paragon Park.

Hut with supplies for shipwreck survivors.

Civil War Fort on an island in the Boston Harbor.