Kastellet

Kastellet is a pentagonal fortification located in Copenhagen, Denmark. It is one of the best-preserved star fortresses in Northern Europe. Construction began in 1662 and was completed in 1667, following the siege of Copenhagen by Sweden. The fortress was designed by Johan Semp, a Dutch engineer, and later expanded and modified by Danish architects.

The primary purpose of Kastellet was to protect Copenhagen from invasion. Its strategic location on the waterfront allowed for naval defense. Over the centuries, it served as a military barracks, a prison, and a command center. During World War II, it was occupied by German forces. Today, Kastellet remains an active military installation, housing the Danish Home Guard and parts of the Danish Defence Intelligence Service.

The grounds of Kastellet are open to the public and are a popular destination for locals and tourists. Visitors can explore the ramparts, see historic buildings such as the Church of the Citadel and the windmill, and enjoy the peaceful park-like setting. The fortress is surrounded by a moat, which is now a popular spot for ice skating in winter. Kastellet is considered a significant historical monument and a valuable example of 17th-century military architecture.