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

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

Believe it or not, this is the final resting place of the man who created the Odditorium.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

A lighthouse built to save lives that took quite a few with its treacherous location.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

The remains of a 12th-century chapter house in Golden Gate Park.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

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.

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.

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

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

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

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

A psychedelic labyrinth on the San Francisco bay.

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.