The Gateway Arch or Gateway to the West is an arch that is the centerpiece of the Jefferson National Expansion Memorial in St. Louis, Missouri. It was built as a monument to the westward expansion of the United States. At 630 feet, it is the tallest man-made monument in the United States, Missouri’s tallest accessible building, and the largest architectural structure designed as a weighted or flattened catenary arch. The Gateway Arch looks taller than it is wider, but it is exactly 630 feet by 630 feet.
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