 Complete the following phrase:  The heart of the exhibition grounds are 16 exhibition halls with a total of 180,000 m2 of exhibition space with the added, when needed, additional 360,000 m2 of open area to the north and east of the site. The two main entrances are located on the western and eastern end, these are connected by a 650 m long and 35 m wide atrium, which allow access to the twelve halls. Located at the western entrance is the International Congress Centre ICM, the exhibition hall and the Messesee. An 86 meter high fair tower stands at the eastern entrance. Architects were Bystrup Architecture Design Engineering, Bregenhøj  Partners, Kaup, Scholz, Jesse  Partner. At the third entrance, to the north, a press center with the World Cup fountain was established for the 2006 FIFA World Cup, it has since been used by Messe München. Upon the completion of construction, the worlds largest photovoltaic system was installed on the roof of the exhibition halls. The system produces about 1,000 MWh of electricity annually. At the north-eastern and south-western end of the show, there are two parking garages with a total of about 5,700 parking spaces. The outdoor area is used as additional parking space or additional exhibition space for major fairs, such as 