The bunker (tunnels below this hotel) were a highlight of my vacation to Berchtesgaden. They were built by the nazis after they stold this sweet old hotel from the owner and appropriated it into their defense system. The owner's daughter bought the property back after the war and her daughter, Ingrid Scharfenberg, is still alive and running the place. She is a delightful person who speaks impeccable English. Before the US Army pulled out of this region in the 1990's, they used this hotel as an officer's retreat and encouraged Ingrid to preserve the tunnels underneath it.
Sadly, I think most visitors these days only see the small section of tunnels that are part of the documentation center which is just a short distance away. They probably don't know about this older section that is far more interesting. You descend by stairs over 200 feet below ground and see the tunnels pretty much as they were left after the war ended. You encounter machine-gun nests, a jail, some sleeping quarters, and other rooms. There are artillery marks in the walls from the nazi's last stand against the allies. The lighting is dim which heightens the experience and in places there are hand-painted explanations of what you are seeing that must be over 60 years old. Ingrid will also give you a nice little souvenir information sheet to read as you wander about the tunnels.
I heartily recommend adding the tunnels below Hotel Zum Turken to your agenda. You can do the whole tour in one-half to one hour. There is free parking at the hotel, or if you are parked at the documentation center parking lot (the starting point to catch the bus up to Eagle's Nest) you can just walk down. It takes about 5 minutes on a well marked path.
BTW, "Zum Turken" means "to the Turk". Be sure to ask Ingrid to tell you the story of how that name came about.
Room Tip: Ask for the rooms facing the valley overlooking the village of Berchtesgaden
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC