Pinal Air Park is located northwest of Tucson. A number of business operate there. It used to be a location for Evergreen International. They carried out a number of programs of a spooky nature which meant there was strict security controlling access to the area. Evergreen have gone bust so now the airport is a lot less restricted. The hangars and ramp areas are still controlled but the roads around the field are now freely accessible.
The airport is used for active operators but also for storage of airframes. Some of these are planes that are clearly not going to be making it back into the air again. They are either old enough to not be in demand or of a type that has more value in the spare parts they contain than as a complete airframe. That isn’t the case for all of them though. Many of them are stored awaiting another operator finding a use for them. Consequently, you see a variety of aircraft from old TWA 747s to unmarked A330s.
While I was there, a Pratt and Whitney 747SP engine testbed was visible on one ramp while the Global Supertanker 747-400 was not far away. There were also some stored Grumman Goose aircraft (should that be Geese?) that looked like they weren’t moving for a while. A turbine Caribou was on the ramp obscured by a CASA 212. Plenty of variety. This would certainly be a fun place to tour with someone that has good access.