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Another sea fortress that guarded the approach to Copenhagen. It is owned by the Danish scouts.
Middelgrundsfortet, known as Ungdomsøen since 2015, is a sea fort located on an artificial island in the Øresund between Copenhagen and Malmö. The fortress is constructed at a point where the seabed is 7 meters below the water surface at the northern meeting point of the straits Kongedybet and Hollænderdybet. Ferries connect Middelgrundsfortet with Langelinie, Copenhagen.
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A unique 30-km² artificially created island, completed in 1914 as part of the city's extensive fortifications. Until Dubai and the Japanese went crazy with this type of construction, it was the largest offshore artificial island in the world. The island was sold to a private company in 2001, but since it is a protected area the new owners must ensure public access to the island. This is handled by Spar Shipping's three to five daily departures during the summer months (120 kr — 30 minutes). The sailing is done via a charming old ferry — MS Langø — from the pier just south of the Nyhavn area, but the island's marina is also open for private yachts. The new owners maintain hostel-like accommodations on the island in the fortress' old soldiers quarters, which can be rented for 800 kr per room with eight bunk beds. There is also a restaurant with traditional Danish lunch and dinners from 80 kr and a kiosk. The owners arrange various activities like treasure hunts, tours and team building activities taking advantage of the old fortress and its history, but this requires larger groups.
Ski slope on top of the huge "Amager Bakke" incineration plant. You can ski, hike, climb, walk up the steps, etc. Or you can just take the elevater up, order a drink at the rooftop bar and enjoy the great view of copenhagen.
Amager Beach
Probably the largest beach in the near vicinity of Copenhagen, artificially constructed some years back. Includes a large sand island and an inner lagoon. There is usually a good range of activities going on, even outside the bathing season, such as windsurfing, diving, water skiing, sea kayaking and some hugely popular beach volleyball fields. If you're visiting during winter you have a chance to show your inner Viking with winter bath on the New Helgoland pier.
Island brygge or Bryggen
Enormously popular green area and city beach, with enclosed salt water pools, including some shallow ones for kids, and a 5-m "jumping" tower, shower, grill and toilet facilities, and it is manned with life guards. Excellent spot for hanging out with locals on sunny days, and it is quite a peculiar sensation having a swim smack in the centre of the city.
Another of Copenhagen's old fortifications, which has been turned into an attractive park. Other than the outline, moat, walls and a few buildings remaining, there is not much to see here in terms of history. But there are some nice views over the sound and you can venture into the open part of the catacombs and see bullet holes from Nazi executions during WWII. A stroll here is easily combined with a visit to Amager Strandpark (see Do section), but otherwise probably not worth the effort.
Copenhagen Concert Hall
Part of the public broadcasters new and problem ridden headquarters in Ørestad, this gem designed by French architect Jean Nouvel is the main reason behind the massive budget overruns of the project — with its final price tag approaching USD 300 million, it is among the most expensive concert halls ever built.