Hollywood Mounds originally consisted of a large platform mound surrounded by a series of smaller mounds. At 20 feet in height, Mound A is the site's central feature and was once enclosed on three sides by connected mounds forming an embankment. These boundary mounds, as well as three mounds to the east of Mound A, were plowed down by the mid-20th century, but their locations have been confirmed by archaeologists. The mounds were built by Native American people during the Mississippi Period, ca. AD 1200-1600.
