The Classical Tour- Berlin in 3 hours

Take a look.
(You won't regret it)

Potsdamer Platz, the Regierungsviertel (Government precincts), Unter den Linden, the Brandenburg Gate, Kurfürstendamm/Kaiser-Wilhelm-Gedächtniskirche, Checkpoint Charlie,  Galarie Lafayette, the Gendarmenmarkt, of course the Berlin Wall, and much more.

You will be pleasently-surprised with the amount of sights you will have gotten to know in three hours.

A great opportunity to be up-to-date!