Join us for our CASTLE Bonus Program, a live virtual program provided by the Senior Learning Network. CASTLE Bonus Programs are provided the first four Tuesdays of every month and are included in your CASTLE Membership. Program Overview: The building of the Casa Grande was a major event of the Classic Period (1100 – 1450 C.E.). The best dating methods available indicate that this large, caliche structure was built during the 1300's. The construction appears to have been well planned and organized, requiring tons of material and a huge cooperative effort on the part of many people. Today we can only marvel at the Casa Grande and try to imagine what it was used for. Though many theories have been suggested, we still aren’t sure as to its purpose. All we can assume is that the Casa Grande must have been very important to the people who built it. Join us as we learn about this fascinating mystery in Arizona!