Two types of EXPOs are held within the framework of Le Bureau International des Expositions (BIE):
The first one is the expo held every 5 years and describe as global and it lasts for 6 months. Such expos were held in Hannover in 2000, in Aichi (Japan) in 2005, in Shanghai in 2010, and will be held in Milan in 2015. EXPOs have dramatically transformed and introduced glorious monumental buildings in host cities. The Eiffel Tower in Paris, the Atomium in Brussels, the Crystal Palace in London and the Vasco de Gama bridge in Lisbon are among these monuments.
The second is thematic expos. Such an expo was held in Zaragoza (Spain) in 2008 for the first time. The theme for that expo held in Zaragoza was ‘water’. Yeosu (South Korea) host the expo in 2012 with a theme of ‘seas and oceans’. Such expos, lasting for three months, are held between two global expos as in 2008, 2012 and 2017.
Apart from aforementioned expos, there are Horticultural Expos. What differs Horticultural expos from others is that it is held with a joint approval of International Association of Horticultural Producers (AIPH). It means that more than one organization have the authority in this regard. In practice, if the Council of International Association of Horticultural Producers adopt the project, then the General Assembly of International Exhibitions Bureau entitles the city and country to host the horticultural expo. People pay a visit to these areas even subsequent to expos, and help the city to turn into an international center in disciplines such as environment, botanics and organic agriculture, and add an ever-lasting value to the city and the country in terms of cultural tourism. The botanic expos, hosted by various countries in various years since 1960, draw major attention around the world. As a substantial contribution to promotion and tourism, the EXPOs attract a large scale of investments to the host city, and improve infrastructure and service areas. Business life and agricultural sectors of the city develop along thanks to such events.