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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

At night, this glittering musical tunnel draws skaters and photographers.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

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.

In one Santa Monica parking lot a mushroom cloud made of chains heralds a message of peace.

The mysterious, untimely death of a Canned Heat band member still haunts this unfinished home.

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

Abandoned in 2009, this once popular resort destination now stands frozen in time.

The beautiful behemoth is one of the largest trees of its kind in the United States.

The tallest bridge in California was constructed for a project that was eventually cancelled.

Four hundred granite steps were built into this massive rock by the National Park Service.

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

The ruins of the castle that chemicals built.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

California's largest steel arch bridge.

360-degree virtual reality chamber physically immerses scientists into their data.

The home of one of California's most important horticulturalists wilts amidst a lovely park.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.