Lemmer is a small town on the IJsselmeer coast in Friesland, popular with sailors and water sports enthusiasts. The harbour fills up in summer with yachts and motor boats exploring the Frisian lakes.
The main sight is the Ir. D.F. Woudagemaal, a steam-driven pumping station built in 1920 and still operational — it is a UNESCO World Heritage site and the largest steam-powered pumping station ever built. Worth a visit even if industrial heritage is not normally your thing.