Kastellet was built in between 1662 and 1725 and was a cornerstone of King Christian IV’s defenses of Copenhagen. It continues to be in use by the army and inside you'll find lengthy, pink brick, slate-roofed properties, a parade floor, and perhaps a Dutch-style windmill. Hans Christian Andersen Monument H.C. https://bookmark-media.com/story17233730/the-best-side-of-things-to-see-in-copenhagen-denmark