We've got two lovely old water mills in my town, both of which have now been turned into flats:
http://s0.geograph.org.uk/geophotos/04/07/73/4077374_7305d1f0.jpg
http://s0.geograph.org.uk/geophotos/02/09/36/2093605_c38ebc34.jpg
With that second one, one of the flats is directly over the river. When it's in flood there's a hell of a noise inside that flat!
There's also a beautiful (fully-working) water mill just a short drive from here:
http://www.stedmundsburychronicle.co.uk/watermills/pakwmfront.jpg
One of my favourite days out is to drive to Houghton Mill, which is a working water mill, set in beautiful surroundings (on the edge of a lovely village, with some great pubs), ownded by the National Trust:
https://d27xe58b9ijigq.cloudfront.net/c=ar16x7/s=w1040,pd1/o=85/https://images.nationaltrust.org.uk/images/1431792160512-ntphilmynott087e7d5.jpg
I lived in Sheffield for 20 years, which is a city which wouldn't exist if it wasn't for the water mills which used to power the knife grinding works owned by the 'little mesters'. Quite a few of the mill buildings still exist but there are far more mill ponds, together with the old 'head goits' and 'tail goits'.