The Casa Grande Photogrammetric Test Range is a test range established in the mid-1960s to test the dynamic performance of aerial survey cameras. The range consisted of 272 concrete calibration markers embedded into the Earth's surface in and around Casa Grande, Arizona, United States. The markers are commonly (and erroneously) believed to have been used to aid camera calibration for the US Central Intelligence Agency's Corona spy satellite program; in fact, they were used as references for aerial surveys through photogrammetry.
Downtown Casa Grande has a number of buildings listed on the National Register of Historic Places. A helpful map of the most interesting buildings can be downloaded here.
About this list
Attractions are associated with the nearest recognisable destination rather than by municipal boundary, so a place just outside Casa Grande still appears here if that is how visitors reach it. None of these publish an official visitor count, so they are ranked on public interest and tourism significance. Each page says so.
Near Casa Grande
The closest attractions outside Casa Grande, measured from the places listed above rather than from a town centre nothing occupies.
