The signage is in German, specifically "Eingang" (entrance) and "Interspar". The presence of a "U4" sign strongly suggests a subway line, which is characteristic of major cities like Vienna. The architecture is modern, clean, and typical of a large European shopping mall. I am fairly confident this is in Austria.

I suspect this is the Wien Mitte shopping center in Vienna, Austria. I am 85% sure.

then: guess