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Hammershus Castle
Hammershus, Northern Europe’s largest castle ruin, stands on a 74-metre rocky plateau in the northwest corner of Bornholm. The castle is thought to have been built on the orders of King Valdemar II and the Archbishop of Lund in the early 13th century, when the Danes were crusading in the Baltic Region. The land on which it was built belonged to the Archbishop, and its construction was probably financed by booty from the crusades. The castle was built over a relatively short period as a coherent complex with a central fort, perimeter forts and moats. The total area covered by the fortifications is around 130,000 square metres.
Aerials from Hammershus from Esben Nielsen
References
http://en.wikipedia.org/wiki/Hammershus
http://www.367ture.dk/site/Hammershus/
http://www.vang-hansen.dk/hammerhusTingbog/HistorienOmMordet1695.htm