Grafton County New Hampshire (Vacant / Not In Use) has 5 places on the National Register of Historic Places including 1 place of National significance and 1 place of Statewide significance. Significant places include Felsengarten and Ashland Gristmill and Dam, Ashland Railroad Station, Dow Academy and Holderness Inn.
The famous person Theodore Thomas is associated with one of more of the Grafton County historic places.
Some of the country's most noteable architects helped create the Grafton County places including John S. Davison. Prominent architectural styles found in Grafton Country are Colonial Revival and Late Victorian.