A cartoon advent calendar for kids, sold by the city of Hanover in Germany, has a tiny drawing of local serial killer Fritz Haarmann, who murdered 24 people during the 1920s. He’s holding a meat cleaver and peeking out from behind a tree, while happy men, women, and children enjoy the holiday all around him. He’s one of 24 famous people from Hanover who appear on the calendar; “It’s part of our history,” says Hans Nolte, the director of the town’s tourism board.