The Sababurg, first called the Zappenburg, then Zapfenburg and today, after the Brothers Grimm fairy tale Sleeping Beauty Castle (German: Dornröschenschloss), is the ruin of a hill castle in the legendary Reinhardswald, a forested upland that runs through the North Hessian county of Kassel. Sababurg is also the name of a district of the town of Hofgeismar in which the castle is found.