We went to the Hamburger Bahnhof art gallery. To get there we had to go to via Lehrter Bahnhof, still under construction as Berlin's new main station, and eerily large and empty. It was snowing heavily as we arrived.
The gallery had some amazing things, and some stupid things, as is the normal way with contemporary art. Its main hall was filled with junk, literally and figuratively, but a lot of the rest of it was really awesome and we spent a long time there.