Here, visitors can swing with the waves of the Pacific Ocean.

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

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

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.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

This golf ball–shaped former desert real estate office now houses a UFO museum.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

A tiny survivor of the Donner Party disaster.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

This 19th century hydroelectric powerhouse was the first of its kind.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Where the first "expert riders, willing to risk death daily" for the Pony Express were recruited.

This 19th century train workshop is a treasure trove of railroad history.

I Street Bridge is the heaviest swinging center bridge in the United States.

A replica of the first public theater built in California.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

An extraordinary mixture of natural beauty and man-made phenomena.