Somewhere in Germany, but where? Wo ist dass?
That is the Naval Academy (Marineschule, MSM) in Mürwik, Flensburg. I tag it with the wrong tag MOS (Marineoffiziersschule, Naval Officers School) because… someone told me the wrong name first, I guess? The typical photo of that building is from the representative waterfront but you can even take a photo from a nearby tower that makes it look like some single towers in forestry hills, something that is more typical a few hundred kilometres to the south. In fact I wanted something similar here, plus a boat. The building is informally called “The red castle by the sea”. As with most romantic castles of Germany it is quite young (1904).