After 1967, the exposition struggled for several summer seasons as a standing collection of international pavilions known as "Man and His World". However, as attendance declined, the physical condition of the site deteriorated, and less and less of it was open to the public. After the 1971 season, the entire Notre Dame Island site closed and three years later completely rebuilt around the new rowing and canoe sprint (then flatwater canoeing) basin for Montreal's 1976 Summer Olympics. Space for the basin, the boathouses, the changing rooms and other buildings was obtained by demolishing many of the former pavilions and cutting in half the area taken by the artificial lake and the canals.