Mystery in Arizona desert, near Oro Valley. Any idea what this mysterious concrete object might be? Lat/Long is on the bottom of one of the photos. pic.twitter.com/TztimLyDCF

— Dan Kaszeta, FRHistS, Legal Juggernaut πŸ‡±πŸ‡Ή πŸ‡ΊπŸ‡¦ (@DanKaszeta) December 26, 2017