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

A huge musical instrument played by the ocean.

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

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

A man-made island in scenic San Francisco Bay.

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 1920s speakeasy that had rum runners racing up and down the shores of California.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The miraculous hydrant that saved the Mission District in 1906.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.