First of all, we have the Brandenburgh Gate, which is nice not only during the day but also at night. Then, the Alexanderplatz, where you can find the TV Tower and the famous clock. The East Side Gallery is also a must. I love the way the Berlin Wall is full of paintings of awesome artists, making it a mark in history, but at the same time, something current and related to the reality of nowadays. The Check Point Charlie was the best well-known crossing point between East Berlin and West Berlin during the Cold War, so you definitely should go there. Pretty close to it, there are the Topography of Terror and the Jewish Memorial, which will teach you a lot more about the history of Berlin, Germany and Europe. And finally, the view from the Park Inn hotel to the TV Tower (I didn’t actually go to the top of the TV Tower, but I think you should try!) and the Reichstag Building. If you wanna visit the building on the inside as I did, you have to book it online previously. It’s free, by the way.