The Gateway Arch is a 630-foot (192 m) monument in St. Louis in the U. S. state of Missouri. Clad in stainless steel and built in the form of an inverted, weighted catenary arch, [5] it is the world's tallest arch, [4] the tallest man-made monument in the Western Hemisphere, [6] and Missouri's tallest accessible building. Built as a monument to the westward expansion of the United States, [5] it is the centerpiece of the Jefferson National Expansion Memorial and has become an internationally famous symbol of St. Louis.
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