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The Eiffel Tower in Paris is one of the world's most recognizable buildings and a symbol of France. The 300 m (986 ft) high tower was designed by Gustave Eiffel as a gateway to the Exposition Universelle of 1889. It was the world's tallest structure for forty years. Eiffel used his experience in building railway bridges when designing the tower, prefabricating the 18,038 wrought iron pieces off site then assembling the pieces with the help of 300 workers.