Heuneburg
The Heuneburg is a prehistoric hillfort by the river Danube in Hundersingen near Herbertingen, between Ulm and Sigmaringen, Baden-Württemberg, in the south of Germany, close to the modern borders with Switzerland and Austria. It is considered to be one of the most important early Celtic centres in Central Europe, particularly during the Iron Age Hallstatt culture period. Apart from the fortified citadel, there are extensive remains of settlements and burial areas spanning several centuries. The fortified citadel measures about 300 by 150 m (980 by 490 ft). It stood on a strategically positioned mountain spur that rises steeply 40 m (130 ft) above the Danube.