Middelgrundsfortet or Fort Middelgrund is a sea fort located on an artificial island in the Øresund between Copenhagen and Malmö. The fortress is constructed at a seabed 7 meter below the water surface, at the northern meeting point of the straits Kongedybet and Hollænderdybet.
It was constructed by Christian IX 1890–94 as a part of Copenhagen's sea-fortifications, partly from material excavated from Frihavnen. It is one of three artificial islands that were created to defend the entrance to Copenhagen's harbor. (The other two are Flakfortet and Trekroner Fort.)
Middelgrundsfortet was the largest sea fortress in the world, and is still the largest man-made island without abutment, with an area, including wave breakers, of approximately 70 000 m²; the buildings total approximately 15 000 m². A HAWK battery was placed on the island. Until 1984 the fortress was a military area; in 2002 it was sold to a private investor. As of 2014, it is on the market for around £12M.
- "World's most covetable castles for sale". Daily Telegraph.
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