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Photo: Alexander Curtis, CC BY-SA 3.0 via Wikimedia Commons
Water-powered flour mill, a three-room local history museum and gardens.
Mill Green Museum is a working watermill in Hatfield, Hertfordshire, England. The building is Grade II* listed and dates from the 17th century. The local museum is in the old miller's house. Three galleries show changing displays of art and local history.
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A pleasant recreational area offering fishing, boating, swimming as well as wide open spaces for dog walking and sun bathing.
It can be seen from the train. No tours. That's about as much as you can do save walk across the (now listed) footbridge. The Factory closed in 2008.
The attractive avenues of Parkway and Howardsgate are worth a visit, with the coronation fountain at their intersection.
Cinema and theatre. Shows a range of productions and offers a bar serving alcoholic drinks which is open for the duration of the entertainment.