Berlin on foot! Some you pay for, some are listed as free but ask for a donation, either way you’ll get some good old fashioned sightseeing. The Reichstag building, the Brandenburger Tor and Hitler’s bunker, see Berlin’s sites on a walking tour.
Walk your way around Berlin with a group of travelers led by an expert guide. Walking tours are a great way to get out and experience the streets of Berlin. Various themed tours take your through different parts of the city. Modern Berlin, Communist Berlin, The Berlin Wall, East Berlin, Third Reich Berlin, or Sachsenhausen concentration camp to name a few.