This blowhole is supposedly caused by a trapped monster.

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

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

Concrete strongholds stand guard over the Golden Gate.

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.

Internationally-recognized arts center housed in a century-old former military barracks.

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 man-made island in scenic San Francisco Bay.

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

Inside this museum, the history of the Walt Disney Family empire is on full display.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

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

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

San Francisco's newly reopened hands-on science museum.

This turn of the century masterpiece has a mysterious goaty interloper.

This private residence was the template for one of the most beloved television homes of all time.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Outside San Francisco lies a small clown cemetery and memorial.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

The haunting ruins of Jack London's dream house.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

Where the writer penned his famous story about a jumping frog.