If you love military history, then you can’t miss the Kastellet in Copenhagen. Your trip to the star-shaped fortress lets you experience history, as the star-shaped fortress is very similar to its original construction in the 1660s, when it helped Denmark fight wars against Sweden. As you walk through the fortress, you appreciate the restoration work done by the A.P. Miller company and marvel at all the bastions, all of which you can walk through; you can look in all 8 of the buildings inside. You probably see the windmill first as you approach Kastellet, but you enter through the King’s Gate (Kongeporten), which was built in 1663. Next you see the state prison and a church, Kastelkirken. Regardless of the season, you are certain to enjoy walking through Kastellet, learning about its history, and enjoying the view.