These subterranean storage areas hold emergency water reserves.

Only hotel where you can legally launder money.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

27-room home built with the fortune of a sugar magnate.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

Guns that have been defending San Francisco since 1904.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Faceless white figures loom over the city from the rooftop.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

One of few lasting examples of the brief octagon craze that developed into folly.

A man-made island in scenic San Francisco Bay.

The miraculous hydrant that saved the Mission District in 1906.

Golden Gate Park's historic collection of plants.

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

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

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

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

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.