Middelgrundsfortet, Sea fort on artificial island in Copenhagen, Denmark
Middelgrundsfortet is an artificial island with a fortress structure located in the Øresund strait between Copenhagen and Malmö. The site contains thick walls, barracks, and interconnected corridors forming a complete fortified complex that sits isolated in the water.
The fortress was constructed between 1890 and 1894 as Denmark strengthened its coastal defense systems. Excavated material from Frihavnen harbor was used to build up the artificial island foundation.
The fort functions as an educational facility for youth groups after scout organizations took it over in 2015. Visitors find a space where group activities and youth programs shape how the former military installation is used today.
The fort is accessible by ferry from Langelinie pier in Copenhagen and primarily hosts group visits and educational programs. Allow time to explore the various sections, as the interior layout is expansive with many connected spaces to navigate.
It is the world's largest independent artificial island with no land connection and stands as one of few fortresses designed to function entirely isolated from the mainland. This unusual location surrounded by water makes it a distinctive destination among coastal fortifications.
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