The haunting ruins of Jack London's dream house.

This abandoned boat was left in place thanks to its rotting beauty.

San Francisco Bay's ghost town.

The rusting remains of the largest assembled WWII fleet on the West Coast.

An Aladdin's cave of old Silicon Valley tech.

Where a staggering 747 ships were constructed during World War II.

An enormous illuminated figure dances on the Las Vegas strip.

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

Faceless white figures loom over the city from the rooftop.

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

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

The only theatre in the world constructed specifically for sound movement.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

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

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

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

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

This infamous prison has a store where you can buy goods crafted by incarcerated people.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

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

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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

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

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