A museum celebrating the self-taught artist-environment builder.

The home of 1.5 million wood letters for printing is still a functioning workshop.

A spiritual vortex among the red rocks in Sedona.

Twisted buildings adorn the banks of the Rhine river.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

The first declared National Monument in the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A fitting attraction for the corn capital of the world.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

A onetime gangsters' hideaway where you can dine on steaks, fine wines, and cigars just like they once did.

World's second largest particle accelerator, where nature reveals its secrets.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The only Bahá'í house of worship in North America and one of only a handful worldwide.