Fortresses in the Beemster
The Beemster was an inland lake until it was drained in 1612. In the Beemsterpolder there are five fortresses that were part of a defensive ring: the Stelling from Amsterdam. The Defense Line is on the UNESCO World Heritage List. Only Fortress 'aan de Nekkerweg' and 'Fortress Spijkerboor' are open to the public.
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