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

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

An essential stop before plundering, BYO Cutlass.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

From the Difference Engine to the Cray-1, all under one roof.

The model behind the iconic 3D test model.

The oldest house in the capital of Silicon Valley.

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

It is locally loved and ridiculed for literally looking like poop.

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

It took years to decode its mysterious messages.

A gathering of green robots at the Googleplex.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

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.

The miraculous hydrant that saved the Mission District in 1906.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

A giant can of fruit cocktail is all that remains of what was once the world's largest cannery.

This prehistoric site is home to the largest shell midden cluster in Japan.