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A Century of Progress %u2022 Vintage PostcardsArena SeriesThe Travel and Transport Building, 504Constructed on the principle of a suspension bridge. No pillars, columns, or arches to support it from below but depends on cables to carry the load of its tremendous roof. Interior diameter%u2014310 feet at the base and 206 feet clear of any obstruction. Inside is shown the progress of transportation from the creaky wagons of a century ago to the most modern water, highway, railroad and air travel.Airplane View of the Hall of Science, 505Recognized as the principal building of the World%u2019s Fair. A superb example of modern architecture, it has the form of a gigantic letter U. The general effect of this temple of science is one of order and massiveness. An outstanding feature is the carillon tower at the southwest corner. The building covers an area of more than eight acres or more than 400,000 square feet.