Dart's Mill is a historic hamlet on the South Branch of the Raritan River located in Readington Township Hunterdon County New Jersey United States. Several mills were built here in the early 18th century. In its height a merchant blacksmith store and complex of mills were here. The last mill at this site burnt down in 1994. Foundation walls and a mill race remain at the site today. On April 29 1982 Dart's Mill was added to the National Register of Historic Places. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
The answer to this question is:
Building