A clear blue swimming hole with hidden caves, still unexplored.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

This former industrial site has transformed into a community sculpture garden that hosts monthly Full Moon parties.

A beer pipeline runs beneath Bruges.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

This sprawling bookstore spans four floors and has more than a million books in stock.

Glass and concrete building designed by Albert Kahn.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

Detroit housing collective working to create an "environment for revolutionary change."

The world’s largest Masonic temple was saved by the White Stripes.

Detroit’s downtown castle is one of the oldest structures in the city.

Concrete igloos standing across from what remains of the Michigan Central train depot.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.