Yuma proving ground

One of the largest military installations in the world covering around 837,000 acres just north of Yuma in the Sonoran desert. The site is used to test military equipment in the course of a year over 4,000 planes leave for combat missions, 36,000 parachutes are dropped, and 500,000 mortar and missiles are fired on the grounds. (Thank you wikipedia) Which explains

Quartzsite, Az

The worlds biggest parking lot. Every winter this tiny desert town, which usually has a population of around 3600 residents. Gets invaded by an estimated 1.5 million Rvers, which is possibly one of the largest rv gatherings in the world. There are 3 major shows the first and biggest is the Rv show bringing in 750,000 to 1 million people alone, the second is the rock