It being a Common, there are not tons of things to do that are indoors.
This museum is nice as it is educational for both kids and adults. Inside they ahve many mini windmills showing how they have developed through the ages. They have a film showing how mills are built, I found this particularly interesting!
Schools come here on visits, so it is advisable to cisit this on a weekend or a public holiday, so the place is not deluged with eager youngesters :)
My two favourite windmills thus far is the one in Rye, and this one :) Okay, I havent travelled the world extensively, nor saw windmills when in Holland, but these are good enough for me.
Its base is octoganal, and brick. All the machinery was placed inside the brick area. It was built in 1817 to provide the locals with organically grown flour.
It halted all work in 1854, and was used as accommodation for a while. One of these rooms is still on view to the visitor.
In 1975 it bacame a museum when renovations were done on it.