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

Nuclear waste dump site now an environmental sanctuary.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

A classically inspired temple in Redwood City.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

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

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

One of few lasting examples of the brief octagon craze that developed into folly.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

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

The oldest lawn bowling club in the United States.

A hidden subterranean installation offers a view of the sky.