sentences:  The Sulm valley has yielded archeological finds from the neolithic period onward, illustrating that it has served as an east-west traverse for thousands of years.In the Iron Age, during part of the Hallstatt Culture period, a settlement on the Burgstallkogel between Gleinstätten and Großklein had considerable regional importance.The associated necropolis, part of which can still be seen, is one of the largest and best-preserved in Central Europe although much has been plundered from the late 19th century onward.