Jefferson National Expansion Memorial consists the Gateway Arch, . During a nationwide competition in 1947-48, architect Eero Saarinen's inspired design for a 630 foot stainless steel arch was chosen as a perfect monument to the spirit of the western pioneers. Construction of the Arch began in 1963 and was completed on October 28, 1965, for a total cost of less than $15 million. The Arch has foundations sunk 60 feet into the ground, and is built to withstand earthquakes and high winds. It sways up to one inch in a 20 mph wind, and is built to sway up to 18 inches. Fees are charged to ride the unique tram system to the top. Acreage: 90.96.

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