Mill Green Museum is a fully working watermill (undershot wheel) run by volunteers and housing the local museum for Hatfield, Herts. You can watch milling of organic flour every week on Tuesday, Wednesday and Sunday, and see the waterwheel in action every day (except for Monday when the mill is closed), which my children love to see.
Lots of gears and cogs and flour leaking out. Children can try grinding corn the hard way or the easy way. In the summer there is a small cafe with outdoor seats in the sensory garden. There is also a local collection of bits of history, with things for children to find.
And it's all free.
Mill Green
Hatfield
Herts AL9 5PD
www.hertsmuseums.org.uk/millgreen/
Tel: 01707 271362
Nearest station is Hatfield (Herts) 23 mins from London Kings Cross every 30 mins (Mon-Sat), 1 fast per hour Sundays, plus two slower. Then either a 20 min walk, 5 mins on a bike National Cycle Network route 12 or bus 301 or 603 every 15 mins, 5 mins ride.
By car, follow signs from A1(M) junctions 3 or 4.
Send your feedback or queries to been.there@guardian.co.uk
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On Fridays lunch is available from 12:00.