This temple, built by an eccentric religious leader before his death, sits guarded and in ruins.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

This stately structure has been abandoned for half a century.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

The Route 66 institution that inspired Taco Bell also served as an important headquarters for Mexican-American social movements.

A museum dedicated to the decorative arts from the 16th through 19th centuries.

This California tree is the single source of the state's entire orange industry.

Mexican food and folk art.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

The only museum and archive west of the Mississippi that is dedicated to the study of Abraham Lincoln.

The Citrus Variety Collection at UC Riverside contains two trees of each of the 1,000+ varieties of citrus.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.