Nurmengard

Nurmengard is a towering, “jet-black” wizarding prison built by Gellert Grindelwald to hold his enemies, quite a forbidding place (DH18, DH23). Carved over the entrance is Grindelwald’s grim mantra: “For the Greater Good” (DH18). And when Grindelwald was defeated by Albus Dumbledore in 1945, he himself was placed in the topmost cell of the tower, held captive for over fifty years (DH18, DH24) where he eventually began to show some remorse (DH35). Finally, in 1998, Voldemort sought Grindelwald out here, looking for information on the Elder Wand, and killed him (DH23).