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

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

The ghostly remains of an accidental sea.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

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

Magical-looking cottages that inspired one of the most famous animated films ever.

This glamorous old building is said to have inspired the Tower of Terror.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

World-famous, Pink's still manages to keep its prized cult fetish status.

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 prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

The legendary building that needed ghostly approval before being built.

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

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

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