The Gehrenberg tower is really worth a recommendation. Tip: sometimes go to fog in Schussental and over Lake Constance on the tower. With a bit of luck you can get over the fog and then often have a great view of the Alps.
Well worth it! People with a bit of respect for height have to pull themselves together a bit: D because the entire floor is made of slanted wooden planks. In good weather, the Prealps are visible. The tower is closed off at dusk