On a map, Slab City looks like Anytown, U.S.A. Streets intersect in a grid-like fashion and have names like Dully's Lane, Tank Road and Fred Road. But it's not until you have "boots on the ground" that the reality of this squatters' paradise in the desert sinks in.

Situated on 640 acres of public land located about 50 miles north of the U.S.-Mexico border in Imperial County, California, Slab City sits on the site of Camp Dunlap, a former U.S. Marine Corps base. During its peak in the 1940s, the camp housed a laboratory for testing how well concrete survived in the harsh climate of the Sonoran Desert, but by the end of World War II, the government shut down operations. Noticing an opportunity, squatters soon staked their claim on the area, building a hodgepodge of residences using the concrete slabs that remained coupled with whatever materials they could find.