I was a little early... Wachsenburg Castle is open Wednesday to Sunday from 11:00 a.m. I visited several times as a child and know the fortress as a beautifully restored and diligently managed attraction. For those who don't want to or can't walk, there's a parking lot below the walls.
The Wachsenburg on the southern edge of the Thuringian Basin, together with the ruin Mühlburg and the ruined castle Gleichen the probably best known castles ensemble in Germany, the Three Equals. The name "equals" is due to the Celtic word "resembling" for rocks or to the topographical similarity of the castles on three conical mountains. The transfer of the name to the entire castles has been documented since the 18th century. However, the three plants never shared a common ownership.