[mountain] The Ipf is a mostly treeless mountain (668 metres), near Bopfingen, Ostalbkreis, Baden-Württemberg, Germany with a prehistoric hill fort on its top. The fort is situated on an isolated hill, with a flattened summit surrounded by a stone wall, ditch and large counterscarp (outer bank). The overall diameter is about 180 metres. Th... Found on http://en.wikipedia.org/wiki/Ipf_(mountain)