The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

An abandoned Cold War missile radar site.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

A temple devoted to inner esoteric mysteries located in a California commercial strip.

The Flatiron Building's storied West Coast cousin is a lot more into religion.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

A vast city of the dead, where the deceased outnumber the living by more than a million.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A creepy steel gremlin has protected the Bay Bridge since 1989.

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

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

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

A man-made island in scenic San Francisco Bay.

A monumental cross hides in the trees in Golden Gate Park.

A monument to the love people have for their pets.

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

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

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

This turn of the century masterpiece has a mysterious goaty interloper.