The BMW World of Experience with Delivery Centre was opened on 17 October 2007 and has attracted millions of visitors to date. There is an 8,000 m² photovoltaic system on the roof. The facade of the main building and the double cone is clad with 15,000 m² glass panels. The designs for this spectacular building were created by the Viennese professor Wolf D. Prix with the architectural office Coop Himmelb(l)au. Structural engineers were Bollinger and Grohmann.