A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

This quirky curiosity shop takes its cues from the world's bazaars.

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.

Home to the "Circus" trees created by Axel Erlandson.

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.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

San Diego's most historic and haunted home.

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

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

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

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

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 programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

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

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

Olfactory delights in San Francisco's Botanical Gardens.