High Up
Who doesn't like to have the overview? Berlin offers a lot of opportunities to look from a bird's eye view. And once you are on such a view and let your gaze wander over Berlin, you immediately feel the sublime of this city and are freed from the earthly for a short moment.
Towers
The most famous towers are the television tower, radio tower and the Müggelturm. But there are plenty of other towers and structures that aim high or try. So get ready to climb a few steps. Wikipedia has lists of Lookout towers, Viewing platforms and Skyscrapers.
Here are all posts at a glance on the subject of towers.
Mountains
Berlin and flat? You will be surprised. There are some mountains over 100 meters high, some of them artificial, and when the weather is good you have fabulous views over the city. And even if the alpine friend thinks that the little hills of Berlin are practically nothing more than Berlins acne, it is still worth climbing the hills. You can find a list of the Berlin hills at Wikipedia.
Here are all posts at a glance on the subject of mountains.