After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A winding path built in secret on the edge of the continent.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

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

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

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

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

Home to the "Circus" trees created by Axel Erlandson.