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Gateway Arch St. Louis. The Gateway Arch Is A 630-Foot 192 M Monument In St. Louis, Missouri. Clad In Stainless Steel And Built In The Form Of An Inverted, Weighted Catenary Arch, It Is The World`s Tallest Arch, The Tallest Man-Made Monument In The Western Hemisphere, And Missouri`s Tallest Accessible Building. It Was Built As A Monument To The Westward Expansion Of The United States.