Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Metro station with a claim to rock n' roll fame.

A restaurant and observation deck built in a unique broadcasting antenna.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This abandoned boat was left in place thanks to its rotting beauty.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Step inside Lucy, the world's largest "elephant."

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

A field of nothing but boulders which resembles a giant's gravel driveway.

Mysterious rocks that ring musically when struck.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

North America's largest accredited model railroad museum.

Oldest building in California still in use.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.