Located near Calhan, about thirty-five miles northeast of Colorado Springs, the Calhan Paint Mines are an area of clay deposits that have seen extensive prehistoric habitation and historic quarrying of the clay for pottery and bricks. In the 1990s, archaeological fieldwork at the site revealed dozens of prehistoric cultural deposits and led to the listing of the paint mines as an archaeological district on the National Register of Historic Places. The area is now maintained by El Paso County as Paint Mines Interpretive Park.