Csalem
Member
Berlin Hauptbahnhof is indeed great, however I wish they hadn't built the unsightly hotel next to the southern entrance.
As for things to see in Berlin, I like the u-bahn bridges over the north-south railway line between Nollendorf Platz & Gleisdreieck (U1/U2). Also, the way U1 goes through the BVG building after Gleisdreieck and then past the Deutsches Technical Museum, with it's Dakota suspended from the roof.
The Deutsches Technical Museum is worth a visit too, it has a load of steam engines and a prototype ICE power car, plus ships, planes & cars and a doodle bug (V1)
Dunno what it is like now, but when I was in the museum in April, most of the modern stuff was absent. I think it was in Leipzig taking part in the 175 years anniversary.