This cabin from the 1850s is one of the first structures built by Chinese immigrants in California.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Concrete strongholds stand guard over the Golden Gate.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

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

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

The key to turning shifting dunes into the green oasis of Golden Gate Park.

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

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

A modest reminder of treacherous waters at the Golden Gate.

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

Golden Gate Park's historic collection of plants.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A hidden world of exotic succulents and cacti.

A fleet of automotive automatons sleep in this otherwise unremarkable urban garage.

This giant slab of driftwood marks the beginning of the Winnemucca to the Sea Highway.

This futuristic German television spire is actually the world's largest digital clock.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

Legendary site where an evil bishop was devoured by rodents.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’