It is one of the most famous squares in Berlin. Locals say "Alex". Alexanderplatz is one of the meeting points of the locals, the most known central square of Mitte district. I guess if you want it or not, you will somehow fall into this region. In addition to being Berlin's transport hub, the TV tower (Fernseh Turm) , that you might want to go out on top, is also in this square. If you intend to see the city from the top you can go to the restaurant on the top. If you are going to go out here at least, go out at night and you will see the city night.