A sculpture for the sun and stars, created by Nancy Holt.

Come for the speed, leave in love with the desert.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

A free, public museum dedicated to the fascinating science of sight.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

An alternate history park where the Union Army loses the war... to dinosaurs.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Outsider art meets paleontology at this roadside reptile repository.