Although it has a very strange graphical setup, the new website
Illinois Windmills is a very rare thing - an American
website, dedicated to real windmills, rather than American wind engines.
There are 4 "original" windmills remaining in the state, and a fifth recently constructed mill.
(The site fails to mention a proposed 6th mill that is hoping to be erected in the next few years). Historical research has shown
around 20 windmills existed in the state at some time, and these are detailed, with pictures where available.
Illinois Windmills website