Facts about windmills
The blades of the Kinderdijk windmills average about 13m. The windmills pump about 40,000 litres a minute.
The cost to keep each windmill operating runs into the tens of thousands of dollars a year.
To run a windmill in the Netherlands you have to be a licenced windmill operator, which means three years of study! Why? Because windmills are complicated and more to the point if the sails turn too fast they can't be slowed down (known as a runaway). The worst case scenario of having a runaway is the windmill tears itself apart (charming).
There are only about 1000 operational windmills left in the Netherlands.
On every second Saturday in May the country celebrates National Mill Day. All operating windmills are open to the public and they all fly blue flags.
Some windmill's grindstones were used to crush the pigments for painters.
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