Buckminster Fuller's Geodesic Dome Being Constructed for the United States Pavilion at Expo 67, 1966-1967

Expo 67, held in Montreal, Canada, was the most attended world's fair of the 20th century. The United States pavilion, a 250-foot-diameter geodesic dome designed by visionary Buckminster Fuller and architect Shoji Sadao, was an interactive environmental exhibit. It remains the most iconic and fondly remembered of Fuller's built designs. This pavilion survives today as an attraction called the Biosphere.