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

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

A man-made island in scenic San Francisco Bay.

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

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

The longest continuous lava tube in Oregon.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

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.

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

A huge musical instrument played by the ocean.

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

An abandoned Cold War missile radar site.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

A psychedelic labyrinth on the San Francisco bay.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Spiral labyrinth hidden in the hills above Oakland, CA.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

San Francisco Bay's ghost town.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A hidden subterranean installation offers a view of the sky.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

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