A 300-ship graveyard, with a few still visible at low tide.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The remains of a ruined mansion memorialize the 1906 earthquake.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

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

A huge musical instrument played by the ocean.

A giant chess set, minus the psychedelic drug trip.

The headquarters of a secretive order is also a beautifully-designed park.

An extensive collection of ancient Egyptian artifacts and mummies.

The largest permanent Monopoly board makes one of the longest games even bigger.

The rusting remains of the largest assembled WWII fleet on the West Coast.

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

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

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

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.