Grab a bike at the base of the TV Tower and spin through town on the relaxed 4,5 hour daily city tour (11:00, from May also 16:00), the Wall tour (Mon, Thu, Sat at 10:30), the Third Reich tour (Wed, Fri, Sun at 10:30) and the Raw tour (counter culture; Tue, Fri, Sun at 10:30); these tours cost €24/22 and no booking is required. Call or email ahead for the Potsdam tour.