Two days and a half in Berlin :)
Berlin, the capital of Germany is a vivid city that never sleeps. It combines modern time and history, the atmosphere is relaxing. It is a real pleasure to walk the spacious streets of Berlin. Don't miss Gendarmenmarkt platz and Potsdamer Platz.
If you are a history geek you will definitely like The Museum Island.
For 7 Euro enter the Berliner Dom and enjoy the view from the top.
Great place! For two days you can see a lot, but there is also much left. I hope I can go back some day :)
Insider Tip:After you buy your ticket for S-Bahn or train you have to validate it in the small device on the station (it is usually next to the ticket selling machine)
Plan at least 2 hours per museum on Museum Island, they are really huge.
If you are nearby visit the pub Deponie (http://www.deponie3.de/), in medieval style, great beer, atmosphere and service.