Okay googling for palaces in Germany and Austria - this looks a bit like Linderhof Palace based on the roof design but I'm not finding a picture that looks like yours exactly.
Righto, here we go. Perhaps a bit obscure but if you've ever been it shouldn't be hard at all. Note all of the people gathered for......something.....
I'll also say that this pic is about 8 years old, so the "skyline" visible here has likely been improved upon (looks like they're even building something at the time of this pic).