The Corporation of London Libraries and Guildhall Art Gallery has launched
Collage,
an image database containing over 20,000 works, including both prints
and paintings dating from 1500 onwards.
Searching for
windmill brought up 48 matches, with the majority being in
London, (Blackheath is especially well represented), but also including
Lytham, Cley, Paris, and a number of Dutch paintings. A search for
mill shows another good selection of images, though unsurprisingly
includes a number where the only link is in the placename.
Collage image database