Grundy County Illinois has 7 places on the National Register of Historic Places including 2 places of National significance. Significant places include Dresden Island Lock and Dam Historic District and Mazon Creek Fossil Beds, Coleman Hardware Company Building, Morris Downtown Commercial Historic District and Morris Wide Water Canal Boat Site.
The famous person Joseph Even is associated with one of more of the Grundy County historic places.
Some of the country's most noteable architects helped create the Grundy County places including Walter Mickle Smith and J.W. Royer. Prominent architectural styles found in Grundy Country are Early Commercial, Italianate and Late Victorian.