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Deutsches Technikmuseum Berlin
Photo: Mazbln, CC BY-SA 3.0 via Wikimedia Commons
Huge technical museum, on a former railroad depot, featuring from ancient water and wind mills to computer pioneer Konrad Zuse's inventions, a collection of old to new vehicles of all types -bicycles, boats, trains, etc - and the interactive Spectrum science center with various hands-on experiments. There's an actual C-17 "Candy Bomber" airplane hanging on its façade. The railroad and aeronautical sections are hard to beat.
Deutsches Technikmuseum Berlin in Berlin, Germany is a museum of science and technology, and exhibits a large collection of historical technical artifacts. The museum's main emphasis originally was on rail transport, but today it also features exhibits of various sorts of industrial technology. In 2003, it opened both maritime and aviation exhibition halls in a newly built extension. The museum also contains a science center called Spectrum.
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Hansa-Studios by the wall
Though the area has changed a lot, the building with the Meistersaal, an old music hall from the 1900s, has persisted. Later converted into sound studios, music history was written here with David Bowie ("Heroes"), Iggy Pop, and U2 amongst the groups who recorded here at the "Studio by the wall". Guided tours available occasionally.
It was a museum of applied arts and a listed historical monument since 1966, and it is now a well-known Berlin exhibition hall.
Topographie des Terrors
This outdoor and indoor history museum documents the terror applied by the Nazi regime. It is on the site of buildings which during the Nazi regime from 1933 to 1945 were the headquarters of the Gestapo and the SS, the principal instruments of repression during the Nazi era.
Take a stroll for a few kilometers along this canal which runs right through the heart of Kreuzberg. It's peaceful and mostly traffic-free, but full of life in summer. Some parts are lined with bars and restaurants with terraces. Sit on a bench or terrace and watch the world go by on a summer evening.
With the Kreuzberg, a hill in Kreuzberg 61, the Prussian National Monument by Schinkel and a waterfall. Superb panoramic views across south Berlin.
Jüdisches Museum Berlin
Designed by Daniel Libeskind with an excellent exposition on the Jewish life in Berlin and the impact of the Holocaust. You can easily spend a day here. There is a metal scanner and other security features you'd rather expect at an airport than a museum.