Pinson Mounds in western Tennessee is one of the United States' most important Middle Woodland ceremonial landscapes and the largest surviving concentration of mounds from that era. Built roughly between 1 and 500 AD, the 400-acre complex includes at least 30 mounds, habitation areas, and a large enclosure, but archaeologists believe it served mainly religious and ceremonial purposes rather than as a permanent settlement. Its most famous feature, Sauls' Mound, rises 72 feet and is the nation's second-highest surviving prehistoric mound. Excavations beginning in 1916 and expanding after 1961 established the site's age, revealed burials and habitation traces, and helped preserve it as a state archaeological park.