I don't know what it is about glass walled buildings that I find so alluring. This selection was shot in Vienna three weeks ago - OMV's HQ in the Hoch Zwei skyscraper at Viertel Zwei plus DC Towers and Tech Gate in Donau-City, as well as a teeny bit of the adjacent UN Office at the Vienna International Complex (VIC).

Incidentally, can you see the lady looking at her smart phone in the picture below?