Königstein Fortress09/12/2016September 12, 2016Königstein is one of the biggest hilltop fortresses in Europe. It's perched some 200 meters above the Elbe River on a rocky plateau. Never in its entire history was it taken by enemy forces.https://p.dw.com/p/1K0PYKönigstein FortressImage: picture-alliance/Arno Burgi/dpaAdvertisement