Expo '98 (in full, 1998 Lisbon Worl Exposition) was an official specialised World's Fair held in Lisbon, Portugal from May 22 to September 30, 1998. The theme of the fair was "The Oceans, a Heritage for the Future," chosen in part to commemorate 500 years of Portuguese discoveries. The Expo received around 11 million visitors in 132 days. 155 countries and organizations were represented.