Eagle's Nest (Kehlsteinhaus), Berchtesgaden

A mountain house built for Hitler's 50th birthday on a ridge at 1,834 m above Berchtesgaden, now a restaurant with spectacular views over the Alps and the Königssee. Special buses climb a dramatic road from the Documentation Centre at Obersalzberg, then a brass-lined lift rises 124 m through the mountain to the house.

It's open from about May to October, depending on the snow. The Obersalzberg Documentation Centre nearby explains the history of the area under the Nazis.