If you do one thing, go up the Reichstag. The queues can be awful, but I found that early evening was the quietest and most spectacular, when the sun was setting.
Other places of note are the German history museum, Stasi Headquarters, Potsdam, the house of the Wansee conference, a bike ride around Lake Potsdam, the East Side Gallery, Checkpoint Charlie and its museum, Potsdamer Platz, the memorial to the murdered Jews, and, of course, Brandenburg Gate.
Quick Tips: If staying in the west of the city, leave the train at Berlin Zoo, and if staying in the east, get off at Ostbahnhof or Lichtenburg. They are building the biggest station in Europe, the Lehrterbahnhof, near the Reichstag, tho...Read More