Marvel’s Thunderbolts #156 and #157 (2011, Luke Cage, Heroic Era) has a WWI German castle which has just returned from a magical tour of the multiverse, populated with nastiness. Baron Gothenvald isn’t a Nazi, but almost all of the concepts would translate well, especially the loss of humanity.
http://www.marvunapp.com/Appendix7/gothenvaldbaron.htm