This collector's home is a constant work in progress.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

L.A.'s oldest operating bowling alley is a beautifully restored homage to its speakeasy days.

Where the line between entertainment and aerospace blurs.

A quirky collection of figurines backdropped by city views is hidden next to a popular restaurant in the Hollywood hills.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

First LEED-certified gas station in the United States.

Space program, pneumatics and more, bits and pieces, for movie sets or the common man.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

Most famous work of one of Frank Lloyd Wright's sons.

Historic funicular railway, believed to be the shortest railroad in the world.

A castle that was built stone by stone by an eccentric journalist.

Rainbow-hued local gem in Venice.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

America's most famous piece of self-built architecture.

One man's homage to the sun continues to grow like a glass fractal.

The legendary building that needed ghostly approval before being built.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

This mysterious artificial cave has long puzzled New Englanders.