Kastellet was constructed in between 1662 and 1725 and was a cornerstone of King Christian IV’s defenses of Copenhagen. It is still in use by the military and within there are actually very long, red brick, slate-roofed properties, a parade ground, and perhaps a Dutch-design and style windmill. Started in https://letsbookmarkit.com/story17136869/about-things-to-do-copenhagen-rainy-day