Hello!
You plan sounds exhausting to me, but you're going to have a great time, too, this way!
;-)
Consider not traveling too far but nearer to your base to maximise the time for actual photography. I just give you some names of places you could easily find and evaluate, like the "Sächsische Schweiz" near Dresden, the whole "Harz" region (special recommendation the "Teufelsmauer" nearby, and "Quedlinburg" a _very_ nice town), for cities Berlin of course. The "Baltic Sea" and "Rügen" is possible, too. Bavaria and Prague isn't too far away, too. You're also relatively near Poland, so it might be worth looking out for places there, as well ("Krakow" and even the "Tatra" mountains). Are you planning to hire a car? Of course it's possible to come around by train in Germany/ Europe, but to find and see lots of locations a car would be required. Also you will spend some time waiting for trains, as the big cities are connected with each other pretty good, but it's not as good in the countryside and even smaller cities, specially at the weekends. I don't think you would like to make pictures of railway-stations ...
I didn't visit some of the above mentioned places, myself, unfortunately, but they are somewhat regarded/ known, I think, more or less, and since you asked ...
Have a great time!
f.