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

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

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

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

A modest reminder of treacherous waters at the Golden Gate.

This sailor's boneyard was lost under a parking lot for decades before being rediscovered.

Visible below the waves are memorials to the city's Gold Rush dead.

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

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

A modern mechanical planetary system, part of a 10,000 year clock.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

A monument to the love people have for their pets.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

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

Internationally-recognized arts center housed in a century-old former military barracks.

Concrete strongholds stand guard over the Golden Gate.

Once the gateway to the utopian dream-village of a Civil War embalmer.

A living time capsule of the 1960s Richardson Bay water-front.

Social saloon from a scrapped trans-Pacific 19th century steamer.

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

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.