The Sababurg claims to be the original castle of Thornrose.
The forest around it, the Reinhardswald has been untouched by human beings for hundreds of years.
It has a tale of its own: Lord Reinhard lost his land gambling and made the deal. He was allowed to sow and harvest one more time on his land.
He sowed acorns and it took more then his lifetime and the lifetime of many of his descendents until the oak grew big enough to be felled. That's how the Reinhardswald was created.