The Shard, London.

This 309.6m, 95-storey sky scraper, completed this year, is the tallest building in the European Union and 2nd tallest in Europe. It boasts a 5-storey viewing deck from the 68th-72nd floor, office space, a hotel, restaurants and a spa.
Made with 11,000 panes of glass, the building reflects the sky above, the appearance changing with the weather and the seasons.