The Victory Column is an enormous tower in old West Berlin. From the top you can see right down the StraBe des 17 Juni towards the Brandenburg Gate, Berliner Dom and the TV tower. Be prepared for a long walk up the many steps though!
GroBer Stern
In the middle of the Tiergarten and situated to the west of Brandenburg Gate. The nearest S-bahn station is Tiergarten
Also be prepared to pay - it's not free.