Would the no voters please send their photo suggestions?
FYI, the economic angle on windmills is that they were used to pump water off land that was then used to grow crops (land surrounded by dikes that's lower than surrounding waters is called a polder in Dutch). Windmills were also used to grind grain for bread. Pretty handy in a country with lots of wind but not many rivers (for water wheels).
Bottom Line: Machines that take advantage of natural flows can be pretty.