The ruins of the Lower Castle are worth a visit. From up here, you have a magnificent view of the Moselle Valley. However, you should be in good shape, as there is quite a bit of uphill walking. The path continues via a Stations of the Cross to the Upper Castle and St. Matthias Chapel.
It takes about 10-15 minutes to walk from the town to the castle ruins. There are also several paths that lead there. One is even a via ferrata. It is very picturesque and there is a beautiful view from the top.