Olympic Stadium

This guide to Olympic Stadium in Montreal recalls a Pink Floyd show on July 6, 1977, when a restless crowd and a bassist's ugly outburst at one fan set an idea in motion that grew into one of rock's best-selling albums. It also follows architect Roger Taillibert, who refused straight lines and compared his poured-concrete curves to medieval cathedrals, and the striking workers, soft ground and ballooning budget that delayed his roof for years. Look up at the ribbed shell and the world's largest inclined tower he was fighting to finish.