Kastellet was built among 1662 and 1725 and was a cornerstone of King Christian IV’s defenses of Copenhagen. It is still in use by the army and within there are actually very long, pink brick, slate-roofed buildings, a parade ground, and perhaps a Dutch-fashion windmill. Christiania has often been connected https://econopass.com/travel/10-must-see-and-do-in-copenhagen/