Sergey Goryachev / Shutterstock
One of the best museums of its kind in Europe, the Nationalmuseet is inside a 18th-century royal residence that's peaked by massive overhead windows. Extensive permanent exhibits chronicle Danish cultural history from prehistoric to modern times. The museum has one of the largest collections of Stone Age tools in the world, as well as Egyptian, Greek, and Roman antiquities. The exhibit on Danish prehistory features a great section on Viking times. The children's museum, with replicas of period clothing and a scalable copy of a real Viking ship, makes history fun for those under 12. Displays have English labels, and the do-it-yourself walking tour "History of Denmark in 60 Minutes" offers a good introduction to Denmark; the guide is free at the information desk.