The concert hall is ok in general. I don't know a ...

The concert hall is ok in general. I don't know a history around this building, but i suppose it is quiet famous. What disappointing is hidden fees. I think a lot of people know that, but the fact that you have to buy some sort of visitor card or whatever its called for 4 euros even when you already have tickets on your hands and you are not planning to come here anymore is annoying.