A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A strange house built only at night, with rumored mystic inspiration.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A one-of-a-kind collection of a unique medium.

A trash dump made beautiful by nature's power.

Its buzzing collection honors vibrator history.

Rainbow-hued local gem in Venice.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The only theatre in the world constructed specifically for sound movement.

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

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

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

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Resting place of Hollywood's immortals is also site of summer film screenings.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

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

A psychedelic labyrinth on the San Francisco bay.

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

Hidden behind a YMCA stands the remains of a ceremonial site that dates back hundreds of years, whose ground is still considered sacred to many Hawaiians.