The Torre Agbar is a landmark skyscraper and the third tallest building in Barcelona, Spain. It was designed by French architect Jean Nouvel, who stated that the shape of the Torre Agbar was inspired by the mountains of Montserrat that surround Barcelona, and by the shape of a geyser of water rising into the air. Its design combines a number of different architectural concepts, resulting in a striking structure built with reinforced concrete, covered with a facade of glass, and over 4,500 window openings cut out of the structural concrete.Photo credit: Diliff