Several tour bus companies operate hop-on hop-off double-decker bus City Circle tours lasting 2.5 hours. Buses run every 10 minutes, with narration in a dozen languages. Kurfürstendamm 220 and Alexanderplatz are the two main starting points, but you can get on and off at some 20 stops. Besides Berolina, the operators are Berliner Bären Stadtrundfahrt (www.bbsberlin.de), BEX Sightseeing (www.berlinerstadtrundfahrten.de) and Bus Verkehr Berlin (www.bvb.net).