This Old Castle-located museum tells the story of the region from the Iron Age until the 19th Century. Many of the overall panels are in English much most of the exhibition is in German. They probably have an English audio guide but I would rather just look.
It is hard to see everything in one day. I started in the Iron Age and then was just exhausted and ran through the final century. I had low expectations for this museum and was pleasantly surprised to see that the artifacts here are high-quality and in the source location. This area really was a heartland of early human history, even the Romans had territory here. This location is also an important part of Celtic history. So much importance! This region is really (like many parts of the world) a crossroad of culture.
Anyway, wear good shoes, you are walking on old marble castle floors. The lighting of the artifacts is understandably low-- it makes taking photographs nigh impossible. They DO carry a lovely coffee table book of their collection in the gift shop. Online, their complete collection appears to be archived and online for display as well.
They have a lovely gift shop (with great scarves) and a cafe with coffee and food. Entrance fee is 6 Euros per adult, very reasonable. read more