Expo 2010 pavilions  This article contains the details of the pavilions in Expo 2010. The 2010 World Expo Shanghai is the largest Expo site ever, covering more than 5.2 square kilometers and containing more than 70 exposition pavilions. More than 190 countries and 50 international organizations registered to participate in the 2010 Shanghai Expo. After the six-month run, the Expo had attracted well over 70 million visitors. The Expo 2010 is also the most expensive fair in the history of World's Fair, with more than 45 billion US dollars invested from the Chinese Government. There were five central theme pavilions at the Expo 2010 – "Urban Footprint", "Urban Planet", "Urbanian", "City Being", and "Urban Future" – each exploring different aspects of urban development. Three of the five theme pavilions were located in the Central Exhibition Building constructed by the host country. Covering an area of 11.5 hectares, it is the largest exhibition structure in the history of World Expositions. The building was located near the Expo Axis, in Zone B. The total exhibition space of this building was 80,000 m². A 7,000 m² multifunctional room in the building's centre had an atrium onto which some of the individual pavilions opened. Construction was completed in September 2009 before interior construction began. The Urban Planet Pavilion was located in the central exhibition building on the Expo Axis. The concept and design were contributed by the German communication agency TRIAD Berlin. The company, which had already designed a pavilion for the Expo 2000 in Hanover, won an international bidding contest against more than 150 competitors. TRIAD Berlin was responsible for construction management and the supervision of the artistic aspects of the pavilion. With its total floor space of 12,000 m², the Urban Planet pavilion addressed the complex processes marking urbanization. According to its designers, the scenography combined Western forms of artistic expression with ideas from the Chinese Feng shui heritage. The exhibition was characterized by a dichotomous structure illustrating the two-faced character of the city as both a consumer of environment and as a place for innovation and technology in the service of an ecological renewal for the future. The first part of the exhibition ""Road of Crisis"" is made of five chapters, each corresponding to the five elements in Wu Xing: Water − Fire − Metal − Wood − Earth. It reflected the potential of destruction emanating from the cities, the threats facing the ecosystem, and the depletion of Earth's natural resources.