n's "q >> this week, we take you to , to explorealabama the southern city, home to the university ofon american history tv, we visit the archaeological site and learn how native american ur

n's "q >> this week, we take you to , to explorealabama the southern city, home to the university of alabama. on american history tv, we visit the archaeological site and learn how native american culture lives from the 11th through the 15th centuries. >> welcome to the archaeological park. in the heyday, it was the largest city north of mexico. it contains the remains of about 30 flattop mounds. we are still -- standing at mound b. thousandns about 1100 pounds of dirt. originally, scientists thought they mounds were built by a basket load of dirt at a time. recent research indicates that the base of the mound, and possibly the sides were initially built with sod which were then filled in with clay. this would give more stability as they were building. we know that periodically after ppedas built, it would be ca over with different colors of clay, so if you sliced into it, it would resemble a cake. >> watch the c-span cities tour. the c-span cities tour, working with cable affiliates and visiting cities across the country. presidentsk back at giving their last speeches at the annual