Many nations have windmills, but the Netherlands has so many of them and they are such a significant part of the nation's industrial and cultural legacy that many people throughout the world associate windmills with the country. From the Middle Ages onward, windmills have been a defining feature of the Dutch countryside. In the heyday of the windmills during the 19th century, there were roughly 9,000 windmills in the country. Even though the Industrial Revolution replaced windmills with steam, diesel, and later electricity, over 1,000 antique windmills, many of which are still operational, still stand throughout the Netherlands thanks to historic preservation initiatives. Today, along with cheese, tulips, and clogs, they are among the most well-known images of Holland. For this reason, visiting a windmill has to be at the top of your travel itinerary when visiting the Netherlands.