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

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

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

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

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

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

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

A huge musical instrument played by the ocean.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This shop specializes in oddities and Victorian-inspired wonders.

A winding path built in secret on the edge of the continent.

The haunting ruins of Jack London's dream house.

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

This contorting sculpture is the tallest in San Francisco.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

Christ's blood preserved in a Belgian town.

A rare example of World War I trenches from the British front.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.