Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

The largest drain hole in the world.

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

It took years to decode its mysterious messages.

The largest permanent Monopoly board makes one of the longest games even bigger.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

A fine mixture of the old and the new topped with an art deco neon spire.

A watering hole where the options for seating include a bar, patio, or subterranean cave.

Hidden in a hotel parking lot is a strange historical plaque erected by an obscure fraternal society.

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

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

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

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This fully intact Neoclassical-Greek Revival style firehouse operated until 1938.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

Once the largest town in eastern Yuba County now sits abandoned.

Built to hold Gold Rush wealth, this building has withstood the test of time.

A mesmerizing disco ball-like sculpture along the Sacramento River Walk.