Three plaques mark the spot where the "forgotten father of broadcasting" worked.

It took years to decode its mysterious messages.

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

Neoclassical Revival mansion and set of horror cult classic Phantasm.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

Ride on a fully-restored Nike nuclear-tipped missile elevator from the Cold War.

An vast warehouse of everyday treasures in Berkeley, CA.

A private home built to resemble the shape of a microscopic creature.

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

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

An extensive collection of ancient Egyptian artifacts and mummies.

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

A giant chess set, minus the psychedelic drug trip.

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

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

The world’s first stop-motion film was created on the racetrack outside this building.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

A hidden world of exotic succulents and cacti.

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

A porcelain company's former dumping ground, completely covered in pieces of collectible ceramics.

Where a staggering 747 ships were constructed during World War II.