Nearly evryone in the world knows the famous Dutch Windmills. But very few of you have seen them inside. In this video master miller Fred Prins shows his polder mill and demonstrates the system inside that keeps the feet dry of many Dutch. Once a year it is ‘Mills Day’ (‘Molendag’). Many mills are open to the public that day. But there are also various mills to visit throughout the year. Check the links below to show all possibilities.