Kastellet

Construction of Kastellet began in 1626 under King Christian IV as the Sankt Annæ Skanse. However, the fortification we see today is largely the result of a massive reconstruction ordered by King Frederick III following the Swedish siege of Copenhagen in 1658-1660. Dutch engineer Henrik Rüse was commissioned to design a state-of-the-art pentagonal fortress that would serve as a crucial defensive point for the city’s harbor, ensuring the capital remained protected from naval invasions.The fortress was designed in a distinct star shape, featuring five bastions named after the royal family: The King's, The Queen's, The Count's, The Princess's, and The Prince's. Beyond its defensive role, Kastellet served as a high-security prison for centuries, housing famous inmates like the reformer Johann Friedrich Struensee before his execution. The site's architecture reflects the military precision of the 17th century, with its uniform red barracks, known as the 'Rows,' and massive earthen ramparts that provided both protection and visibility over the surrounding waters.In the modern era, Kastellet remains an active military site, housing the Danish Home Guard and Military Intelligence, yet it has evolved into a beloved public park. Extensive restoration work in the late 20th century preserved its historic integrity, including the iconic 1847 windmill used to grind grain for the garrison. Today, it stands as a unique blend of a living military facility and a peaceful recreational space where locals and tourists alike can explore centuries of Danish history while enjoying the lush greenery of the Copenhagen waterfront.