The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

An underwater city for the dead.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

Where monkeys run wild and the humans are caged.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

Historical trolley restoration and operation at History San Jose, Kelly Park.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

A unique attraction and museum dedicated to exploring iconic roadside structures.

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

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

A huge musical instrument played by the ocean.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

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.

A creepy steel gremlin has protected the Bay Bridge since 1989.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

First LEED-certified gas station in the United States.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

One of the world's longest murals depicts the history of diversity in Los Angeles.