National Register Listings in DeKalb County, Illinois
Ashelford Hall
Brower, Adolphus W., House
Chicago and Northwestern Depot
Egyptian Theatre
Ellwood Mansion
Elmwood Cemetery Gates
Glidden, Joseph F., House
Gurler, George H., House
Haish Memorial Library
Marsh, William W., House
Nisbet Homestead Farm
North Grove School
Rollo Congregational United Church of Christ
Sandwich City Hall
Shabbona Hotel
Sycamore Historic District
von KleinSmid Mansion
Illinois was part of the French colonial empire, and the city of Cahokia, located near present-day Collinsville, was one of the largest pre-Columbian cities in North America. At its peak, around 1250 CE, Cahokia had a population of around 20,000 people.