 The Eiffel Tower, built by Gustave Alexandre Eiffel for the 1889 Universal Exposition, averages around 6 million visitors a year.Further east along the bank of the Seine lies the former Paris-à-Orléans train station built for the 1900 Universal Exposition.Closed in 1939, it has been since renovated into a museum of 19th-century art, the Musée d'Orsay, open to the public since December 1986.