Home to the "Circus" trees created by Axel Erlandson.

A strange house built only at night, with rumored mystic inspiration.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

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

Four miles of pipelines form the model of still-functioning retro-tech efficiency.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

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

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.

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

San Francisco Bay's ghost town.

Historical trolley restoration and operation at History San Jose, Kelly Park.

A giant chess set, minus the psychedelic drug trip.

The headquarters of a secretive order is also a beautifully-designed park.

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

Faceless white figures loom over the city from the rooftop.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Its buzzing collection honors vibrator history.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Only hotel where you can legally launder money.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

Furniture tries to escape an abandoned building in San Francisco.