Housed in the former headquarters of the Stasi, or Ministeriums für Staatssicherheit as it was formally called (see, we learned something), it's a sobering memorial to a time when every block of flats had its paid informer, children were encouraged to report suspicious behaviour by adults, and all letters might be intercepted and steamed open.
There was also a lot of old tech and ridiculous spy gadgets (they got most of their cameras from the West, incidentally, because they were better). These appealed to me a great deal, as did the 'everything is brown' 1970s aesthetic.
We took the free guided tour in English, which was very good and delivered a lot of facts and stories we wouldn't otherwise have found out.
We learned that there was just as much mistrust and surveillance within the organistion as outside it, making the Ministry a far from happy workplace, and that one room had once housed a huge computer, but nobody will admit to having any idea what it was like; it was destroyed and no photos survive.
In the evening, we watched Austin Powers: International Man of Mystery.