I’ve been to quite a few abandoned places now. But Beelitz-Heilstätten is definitely the biggest. It’s also one of the most remote as there’s not a lot else in the area. I think the size and remoteness has resulted in a lot less vandalism and graffiti inside the buildings. There were some interesting creations though, including instructions to trespass (check) and to teach children to worship Satan. The Satan comment was painted at the front of a large grand lecture hall.