This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

The largest ancient burial mound in Ohio.

A real flying saucer, contracted by the U.S. Air Force.

The whimsical construction on the roof has given rise to many a Montgomery myth about its contents.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

This botanical garden has been nicknamed "Alabama's Little Corner of Greece."

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

Booker T. Washington's home at the Tuskegee Institute was a gem of splendor.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

This eatery transports diners to a place that no longer exists: East Germany.

This hands-on math museum believes in turning concepts into constructs.

One of Los Angeles's first murals once vibrantly depicted the dangers of United States imperialism.

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

The largest whiskey stash on the West Coast survived the 1906 fires--but not without heroic effort.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A stranded woman lived alone on this remote island for 18 years, inspiring the great children's novel "Island of the Blue Dolphins."

An abandoned 1920s-era stretch of cabins now overshadowed by the 66 Motel.

A museum, art project, and institution that demands we look at the world around us in a strange new way.

Guns that have been defending San Francisco since 1904.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

Crumbling pink walls and murder memorials preserve the pioneer history of Joshua Tree.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."