Near Leamington Spa (Warwickshire) there is a wonderful beautiful place to visit called Chesterton Windmill. It is a used windmill that is still open for people to visit and it is brilliant photography location.
It is free so it is fab place to take kids if they need some fresh air to run around and such alternative to explore with kiddliwinks. My boys loved it and enjoyed hearing about the mill and what it was used for.
The windmill is also situated in the beautiful Warwickshire countryside. There appears to be not many people come to visit, which are one hand is a shame but on the other is lovely and peaceful. You are not allowed to use drones, unless you ask permission from the farmer, which I think is fair enough.
The mill is in a field which you have to close the gate after so fairly safe for little ones and you walk up a short distance up a hill, nothing too painful.
Defiantly go check it out as it is stunning location like I have already stated above.
You can find more about Chesterton Windmill here.