Paying for a city tour? What for? There is a great alternative for the regular price Bus number 100.
Start at the Alexanderplatz and go to the Zoo (which is worth visiting too, though it's another story).
With the 2.10 Euro ticket you trip can last up to 2 hours which means that you can get out at any stop and proceed your journey with the next bus. And for 6.30 Euro you can travel Bus, S-Bahn and U-Bahn in the zones A and B the whole daylong.
Anyway if you start at Alexanderplatz, you will drive past the
Lustgarten & Museumsinsel / Museums island,
and State Opera (from which it's just a 5 Minute walk to one of the most beautiful Berliner squares Gendarmenmarkt).
You will see almost the whole Unter den Linden street.
The bus will stop right in front of the Reichstag, from which you can walk to the Brandenburger Tor, Pariser Platz and the Memorial For the Murdered Jews of Europe.
From the bus you will catch the sight of the
Haus der Kulturen der Welt/ House of the Cultures of the World,
Siegessäule/ Victory Column,
and Kaiser-Wilhelm-Gedächtniskirche/ Memory Church.
Mind that most times of the day the bus is as full with people as a cucumber with seeds. No wonder as for many tourists it is the best way to explore Berlin.
Take the S-Bahn to get back to the Alexanderplatz and to enjoy a couple of nice views of Berlin or may be to get out at the Hackescher Markt for a relaxing beer in one of the hundrends of street cafes.
Yes, afther the 100 Bus journey you definitely deserve a beer!
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