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Nederland, Noord-Holland, Beemster, 16-04-2012;  De Beemster, 400 jaar 1612 - 2012. Fort Spijkerboor aan de Westdijk van de Beemsterringvaart. .Fortress Spijkerboor, part of the Defensive Line of Amsterdam also world heritage, (bottom right)..luchtfoto (toeslag), aerial photo (additional fee required);.copyright foto/photo Siebe Swart