1975, Okinawa, Japan - Expo '75

Expo '75 was held on the island of Okinawa, Japan from July 20, 1975 to January 18, 1976. The ocean-themed fair was conceived, in part, to commemorate the American handover of Okinawa to Japan in 1972. The centerpiece of Expo '75 was the Aquapolis a floating ocean platform designed by Seikun Kikutake.