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

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

San Francisco Bay's ghost town.

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

This abandoned-looking amusement park is frighteningly open for business.

The yawning remains of a complex naval fortress still haunt this Australian shore.

Nature is leading a successful mutiny on this century-old freighter.

Australia's first opal field led to a mining rush in the 1890s.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

Abandoned anti-ballistic missile base.

This cavern was used as a hidden hospital and safe house during the Vietnam War.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

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

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

Former 1954 Del Mar Train Station now serves signature cocktails and delightful culinary treats, and still operates as a Metro stop.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Abandoned bridge hidden deep in the San Gabriel Mountains.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

A bright little alley in La Boca is a part of tango history.