This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

An optical illusion found amid a logged redwood forest.

A former utopian healing center created by a huckster and built by derelicts.

An overlooked and unassuming engineering marvel.

Hundreds of trees made from glass bottles make up this forest on Route 66.

Commonly referred to as the most photographed Victorian home in the United States.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Acres of natural wonders left behind by a socialite-turned-gardener.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

An eclectic trailer park retreat in the middle of the California desert.

One of the last free public hot springs is decorated with hippie art.

The unbelievably opulent home built for an infamous newspaperman.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

A storybook European village in Berkeley.

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.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

The site of murders and Satanic cult gatherings.

The ghost town that ended up on Ebay.

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

The remains of a ruined mansion memorialize the 1906 earthquake.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Abandoned bridge hidden deep in the San Gabriel Mountains.