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160th Anniversary of the First World's Fair and Google doodle today is special to remember it.

The main attractions at World's Fairs are the national pavilions, created by participating countries. At Expo 2000 Hannover, where countries created their own architecture, the average pavilion investment was around €13 million. Given these costs, governments are sometimes skeptical about participation as benefits are often assumed not to outweigh the costs. Tangible effects are difficult to measure; however, an independent study for the Dutch pavilion at Expo 2000 estimated the pavilion (which cost around €35 million) generated around €350 million of potential revenues for the Dutch economy. It also identified several key success factors for world exposition pavilions in general