 The other sites are Millstone Bluff, a prehistoric Mississippian settlement in the Shawnee National Forest, and the Pope County portion of the Kincaid Mounds, a prehistoric city in the Ohio River floodplain.The historic district located along Illinois Route 146 and was added to the Register in 1976.The Buel House, a historic home built in 1840 and currently owned by the Illinois Historic Preservation Agency, is included within the district.