Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The huge granite obelisk that towers over a small California town.

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

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

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

Concrete strongholds stand guard over the Golden Gate.

A century and a half of research in the sciences and natural history, still going strong.

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

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

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

Radioactivity still cause for concern at this urban explorer's paradise.

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

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

A shining, cold, black organ lies in San Francisco's financial district.

Faceless white figures loom over the city from the rooftop.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Recovered from the brink of extinction, at home in the Financial District.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

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

A man-made island in scenic San Francisco Bay.

This infamous prison has a store where you can buy goods crafted by incarcerated people.