Rosenburg Castle in Lower Austria View Larger Image An eight-hundred-year-old renovated castle surrounded by a deep forest over Kamp – the longest river in the Waldviertel region. I suppose this castle rock is more than 100 meters high. View from the side of the access road. Kamp – the longest river in the Waldviertel region. By Piotr|2022-08-02T18:23:24+00:002019-05|Categories: Horn District|Tags: Castles and palaces, Waldviertel| FacebookLinkedInWhatsAppXingEmail About the Author: Piotr Digital Naturalist and Land Explorer. Enjoy reading articles and looking pictures! Leave A Comment Cancel replyYou must be logged in to post a comment.