A while ago we visited Museum Küppersmühle in Duisburg (Germany). Art works like 'Traum des Künstlers' by Markus Lüpertz and the 'Sternenlager' works by Anselm Kiefer were definitely worth the visit, as was the building itself with the modern architectural addition by Herzog & De Meuron.
The main entrance and the staircase from the outside.
I took a few pictures of the spectacular staircase from the inside as well.
(click to enlarge / fit screen)
To be honest, it's not enough to look at the pictures (then again- is it ever?). This is one of those interiors you'll want to experience yourself- you just have to see and feel the material that was used up close and personal.
The area itself, the inland port, is beautiful as well. We'll definitely want to visit there again.