Guns that have been defending San Francisco since 1904.

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

Golden Gate Park's historic collection of plants.

The oldest lawn bowling club in the United States.

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

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

An overlooked and unassuming engineering marvel.

A huge musical instrument played by the ocean.

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

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

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Furniture tries to escape an abandoned building in San Francisco.

Only hotel where you can legally launder money.

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

Radioactivity still cause for concern at this urban explorer's paradise.

An enormous illuminated figure dances on the Las Vegas strip.

A man-made island in scenic San Francisco Bay.

Spiral labyrinth hidden in the hills above Oakland, CA.

A 90-acre park on former landfill that hosts an annual kite festival.

One time home to turn of the century explosives, now hidden under the Bay Bridge.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.

An vast warehouse of everyday treasures in Berkeley, CA.

Playable, historic pinball machines fill this Alameda museum.