The best day trips from Berlin by train are Potsdam (under 45 minutes away), the Sachsenhausen Memorial, the Spreewald canals, Leipzig and Lutherstadt Wittenberg, with Dresden and the Bastei Bridge in Saxon Switzerland for longer days. Potsdam, Sachsenhausen and the Spreewald are all on regional trains, so a €63 Deutschlandticket or a €36.50 Brandenburg-Berlin Ticket…