Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

The largest drain hole in the world.

A replica of the first public theater built in California.

I Street Bridge is the heaviest swinging center bridge in the United States.

The California capital city once stood 10 feet lower than it does today.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

This 19th century hydroelectric powerhouse was the first of its kind.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

The oldest continuously operating church in California.

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

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

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

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

This abandoned boat was left in place thanks to its rotting beauty.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

340 bicycles, 65 feet high.