A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This giant shopping mall still holds signs of its automotive past.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

A giant chess set, minus the psychedelic drug trip.

A Roman-inspired temple once controlled half of San Francisco's waters.

It should come as no surprise that the world's largest artichoke lies in the town that calls itself the "Artichoke Center of the World."

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A strange house built only at night, with rumored mystic inspiration.

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

Three hundred years of preserved Spanish colonial history in San Antonio.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

This failed condo development was reborn as a street art hub.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

A multimedia experience that chronicles the atrocities of racism.