Kinderdijk is a UNESCO World Heritage site southwest of Rotterdam with the most concentrated collection of historic windmills in the Netherlands — 19 of them, built around 1740, lined up along the polders in a landscape that has become one of the country's most photographed scenes.
The mills were built to pump water out of the low-lying Alblasserwaard polder. Modern electric pumps do the job now, but the mills are maintained and can still be activated in emergencies. From April to October you can enter the Nederwaard Museum Mill to see the machinery and living quarters inside, and visit the Wisboom Pumping Station for the story of how the polder was reclaimed. The best way to take in the full row is by walking or cycling the path along the canal — in the early morning or late afternoon, when the light catches the sails, it is genuinely striking.
Kinderdijk is an easy day trip from Rotterdam or The Hague. A Waterbus ferry runs from Rotterdam Erasmusbrug directly to Kinderdijk in about 35 minutes.