We parked the truck halfway up the road to the top of Harqua Hala Mtn, then hiked the rest of the way on the well-kept 4WD trail. At the top sits the remains of the Smithsonian Solar Observatory circa early 1920s. The building has been recently restored (given structural support) but the decks and outbuildings have all disappeared. The important thing, though, is that I believe we figured out the location of their croquet lawn. The B&W shots at the beginning were scanned and cropped from Pieter Burggraaf's publication "Harqua Hala Letters. The Story of Arizona's Forgotten Smithsonian Observatory" Bureau of Land Management, Cultural Resources Series, no. 9, 1996. These scans give some idea of the observatory and it's living conditions during peak operation. I also included a few shots displaying the late autumn afternoon Sonoran desert and flora during the hike back down to the truck.