Gendarmenmarkt is a large square fronted by 3 beautiful buildings - the German Cathedral, French Cathedral, and concert hall. It was built in the late 17th century and named after the Regiment Gens d'Armes, a Prussian regiment made of French Huguenots. Both churches are open but to different extents. The French Cathedral was built between 1701 and 1705 as the place of worship for the Huguenot community. Identical but functionless towers were added to it as well as the German Cathedral in the 1780s under King Frederick II's orders. Nearly destroyed during World War II, what we see today is a reconstruction from the 1980s, and you can climb up the tower to the outdoor observation deck on the dome. Although it is slightly cheaper than going up Berliner Dom (5.25 euros vs 7 euros with a Welcome Card), you do get what you pay for. I prefer the Berliner Dom's view, which is wider as it is also higher. For a good angle of the TV tower with the grand cathedral, I suggest going up a skyscraper in Potsdamer Platz instead. The German Cathedral was built between 1701 and 1708, and rebuilt about 80 years later. Similar to the French Cathedral, it was rebuilt, with a museum inside about Germany's parliamentary democracy.