Middelgrundsfortet

Christian IX's government constructed the fort between 1890–94 to serve as a part of Copenhagen's coastal fortifications, partly using material excavated from Frihavnen. It is one of three artificial islands that were created to defend the entrance to Copenhagen's harbour. The other two are Flakfortet and Trekroner Fort. Middelgrundsfortet was the largest sea fort 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 in the 1950s. The fort remained an active military installation until 1984; in 2002 it was sold to a private investor. == Ungdomsøen ==

In 2010, the island became available for sale at a price of 75 million Danish kroner. Two scout organisations, Det Danske Spejderkorps and KFUM-spejderne, bought the island in April 2015 for 20 million kroner (£1.94M) with money donated by the A. P. Møller and Nordea funds. The camp can accommodate over 650 outdoor, and 40 indoor, sleeping guests. 10,000 people had visited the camp. The KUNE music festival is hosted at the camp. A youth summit, "Young Europe Cares", was hosted by youth activist group Young Europe Is Voting/Youth4Europe at the Ungdomsøen in May 2019. ==Cultural references==

A view of Middelgrundsfortet from the northwest is seen at 1:07:16 25 in the 1975 Olsen-banden film The Olsen Gang on the Track. == References ==