Hohenschwangau is a village in Bavaria, Germany. In A Grimm Warning, Conner and Bree drive here by bike from Munich in order to get to Neuschwanstein castle. They make a plan to sneak along with a guided tour and then hide in the castle until nightfall, but the tours are all sold out that day. Then they meet Emmerich, a local boy, who helps them get into the castle. The other castle that is mentioned in the quote above is Hohenschwangau Castle. It is said to receive over 300,000 visitors a year. Emmerich lives in the village with his mother.