If you go to berchtesgaden, the Eagles Nest is open and is a huge tourist attraction, not as well visited but still open for a visit is the Berghoff, which is nothing more than trees and a few concrete walls, since it was bombed by the British...and other monuments to he Nazis are still around if you look...
While stationed in Germany during the 60's, my wife and I spent a week in this area. Definitely beautiful, enchanting but with a somewhat ominous and mysterious aire about it. There was a fabulous pre-war hotel there called the General Walton Walker which was made into an R & R destination for GI's. You could walk from there around Hitler's Berghof house. Much destruction still evident...bomb craters, mine warnings etc. Once in a lifetime experience.