|Torfhaus Ski Resort in Germany's Harz Mountains. Brocken in the background.|
"This is the highest hill in the former east Germany. A small exhibition exists to their State Security monitoring station at the top."
Now, the speculation I mentioned is based on the postcard scan above - you can see the antenna masts in the background from this ski resort in the Harz Mountains. It was a place we used to go as often as we could during season, despite the 4-hour drive and two border crossings from Berlin. We figured it was either a spy station, or maybe, but not likely, a television broadcast station.
Much of the video tracks the very interesting train ride up the mountain and back down,. There is a first glimpse of the old Stasi site at around 6:45-50 and another begins at around 7:30. A tour of the site begins in the 11th minute.
Manfred continues with some video of hiking in the Harz. We exchanged a couple of messages about that, it's something that I'd be interested in, if the chance ever comes up. Definitely beautiful countryside. And excellent memories.