US Department of the Interior @Interior
Effigy Mounds National Monument preserves over 200 ceremonial mounds that are sacred to the monument's 21 culturally associated Tribes. Built between 650-1200 CE, the more than 200 mounds are found in one of the most scenic sections of the Upper Mississippi River Valley. https://t.co/LceU1mhBVh — PolitiTweet.org