Windham County Connecticut (Vacant / Not In Use) has 13 places on the National Register of Historic Places including 1 place of National significance and 6 places of Statewide significance. Significant places include Fourth Camp of Rochambeau's Army, Brayton Grist Mill, Glen Falls Bridge, Hemlock Glen Industrial Archeological District and New Roxbury Ironworks Site.
Some of the country's most noteable architects helped create the Windham County places including Ebenezer Lyons, William Patterson, Berlin Iron Bridge Company, F.P. Sheldon Co., E.I. Wilson, John J. McMahon, J.C. Fowler and Hiram Franklin. Prominent architectural styles found in Windham Country are Greek Revival, Romanesque and Classical Revival.