6) 3 p.m. Shop like a Socialist

Good news, comrade! Both ends of Karl Marx Allee — or at least between Frankfurter Tor and Alexanderplatz — are book ended by Humana Second Hand & Vintage shops. The outlet at Frankfurter Tor is the largest secondhand shop in Berlin: four floors of vintage and used duds. The top floor focuses on clothes from the 1950s to the 1990s, and there are often select racks for G.D.R. clothes at either or both locations. If you like your Socialist souvenirs even more kitschy, head to Ampelmann, south of Alexanderplatz, a shop that sells images of the “traffic light man,” an East German symbol that has become iconic since the fall of the Wall, on everything from golf balls to coffee mugs to T-shirts.

7) 5:30 p.m. Walking the Wall

The East Side Gallery in Friedrichshain; the long stretch of the Berlin Wall that is clad in colorful iconic images; and the Wall Museum: These sites all get ample visitors. But the most sobering way to get a sense of what it was like to live in Berlin during the time of the Wall is at the Berlin Wall Memorial in Prenzlauer Berg. This portion of the wall and the harrowing section known as the “death strip” — with its booby traps, armed guards, towers and trenches — allow visitors to see the most preserved swath of the remaining wall complex. Admission is free.