Troyville Earthworks(16 CT 7) - Credit: Wikimedia Commons
Troyville Earthworks (16 CT 7) is a Woodland period Native American archaeological site with components dating from 100 BCE to 700 CE during the Baytown to the Troyville-Coles Creek periods. It once had the tallest mound in Louisiana at in height. It is located in Catahoula Parish, Louisiana in the town of Jonesville. The site is the type site for the Troyville culture of the lower Ouachita and Tensas River valleys. Before it was destroyed for bridge approach fill in 1931, the main mound at Troyville was one of the tallest in North America. Read more on Wikipedia
Source: en.wikipedia.org