This print shop boasts one of the largest pinball arcades in San Francisco.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Gold Rush-era tombstones line the park's paths.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

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

In this century-old literary safehouse, print is alive and well.

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

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

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

A 140-year-old castle with underground caves hidden in San Francisco.

A huge musical instrument played by the ocean.

The rest of him lived another 61 years and was buried elsewhere.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.