From 1959 there was a French listening post on the summit, which was supplemented in 1968 by a 64 m high concrete tower. This tower stood empty from 1993 and was demolished on 11 October 2002; the entire facility being removed in September 2003. Other listening posts in the Harz were located on the Wurmberg and the Stöberhai. Towers that still exist include those on the Ravensberg and the Bocksberg, the latter not far from the Schalke.