Another "gateway"; this one, to the west. Where is this arch, the tallest manmade monument in the U.S.?

Answer St. Louis

Not only is the Gateway Arch the tallest manmade monument in the U.S. ; it's the tallest manmade arch in the world. The Gateway Arch is called the "gateway to the West." Located in St. Louis, Missouri, the arch was completed in 1965 and designed by Finnish-American architect Eero Saarinen. Situated on the bank of the Mississippi River, you'll have quite a view when you take the tram 630 feet to the top!

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