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

A famous alternative culture epicenter and where Joplin serenaded young hippies.

A man-made island in scenic San Francisco Bay.

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

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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

The miraculous hydrant that saved the Mission District in 1906.

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

Half of a house.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

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

An overlooked and unassuming engineering marvel.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

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

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

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

With the touch of a button, you can read a randomly selected short story.

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

A hidden subterranean installation offers a view of the sky.

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

The remains of a ruined mansion memorialize the 1906 earthquake.

A 300-ship graveyard, with a few still visible at low tide.

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