A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

A Roman-inspired temple once controlled half of San Francisco's waters.

The longest burning light bulb in the world.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Oldest building in California still in use.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.

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 tribute to the life and work of the beloved "Peanuts" cartoonist.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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