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

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Art in the form of a winding, man made crack in stone.

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

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

Faceless white figures loom over the city from the rooftop.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

A man-made island in scenic San Francisco Bay.

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

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

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

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

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

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

This turn of the century masterpiece has a mysterious goaty interloper.

A monument to the love people have for their pets.

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

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

Tiki luxury on Nob Hill.

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

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

A modern mechanical planetary system, part of a 10,000 year clock.

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