A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

Floating man-made island and upscale restaurant.

Once the fastest ship from San Francisco to Tahiti, the Galilee now lays in pieces in three different cities.

The only visible piece of San Francisco's most famous shipwreck.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Faceless white figures loom over the city from the rooftop.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

The miraculous hydrant that saved the Mission District in 1906.

Gold Rush-era tombstones line the park's paths.

An overlooked and unassuming engineering marvel.

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

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

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

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

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

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

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

Its buzzing collection honors vibrator history.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Saved by the community from destruction, this sign has become a national treasure.

This sculpture honors the legacy of Australia's now-defunct, Black Rock Stakes wheelbarrow race.