Jerusalem Mill Village is a living history museum that spans the 18th through early 20th centuries. One of the oldest and most intact mill villages in the U.S. state of Maryland, Jerusalem is located in Harford County, along the Little Gunpowder Falls River. It also serves as the headquarters of the Gunpowder Falls State Park. The site was added to the National Register of Historic Places on August 20, 1987. Also on the National Register of Historic Places and located nearby are Jericho Farm and the Jericho Covered Bridge.