A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

The ghostly remains of an accidental sea.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

Towering basalt columns, a creation of fire and ice.

A hand-built folk art installation covered with messages of God's love.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

An alley covered with 20 years of bubble gum.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This massive redwood tree has a hole in the base big enough to drive through.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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

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

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

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