The aptly named Chris Mills checks Thelnetham Windmill for visitors on Sunday and Monday. The mill, built in 1819, is run by volunteers and now mills its own flour.
It was derelict until bought by enthusiasts in 1979 and given an eight-year restoration.
Guides will show you round from 11am to 5pm.
The mill will also be open for National Mills Day on May 10, then on June 14, July 19, August 30 and 31, September 12 and 13 and October 11.