The ruins of the castle that chemicals built.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

This unique bed and breakfast was first constructed during the 1800s by a Russian immigrant family.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The unbelievably opulent home built for an infamous newspaperman.

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

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

One poet's handmade, anachronistic home.

This eagle-topped spire remembers the military commander who snatched up California for the United States.

Hopeless romantics will swoon over the sweet story behind this bright and colorful home.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

A train tunnel that was made obsolete by the dam it helped create.

The oldest orange tree in California spawned a generation of citrus farmers.

A picturesque example of brute-force engineering conquering nature.

One of the largest fleets of armored vehicles in the world, sitting out in the California desert.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

A lighthouse built to save lives that took quite a few with its treacherous location.

This 19th-century museum inside of a lighthouse is only accessible during low tide.

These cinderblock farmhouses were actually World War II radar stations in disguise.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.