The Berlin Marathon is one of the fastest and most popular marathons in the world, due to the flat, fast nature of the course. Starting and finishing at the city's famous Brandenburg Gate, the looped course takes in sights such as the Reichstag, Berliner Dom and the Berlin Cathedral. Over 40,000 people take part in this annual marathon, with millions more lining the streets to cheer. Along the route on the day of the marathon, around 60 bands play to…