While the Gateway Arch is America's tallest monument, several buildings, such as New York's Empire State Building (1250 feet) and Chicago's Sears Tower (1454 feet) would loom over the Arch.

The Gateway Arch in St. Louis, Missouri, is the tallest man-made national monument in the United States, standing at exactly 630 feet (192 meters) tall. It is also the tallest man-made monument in the Western Hemisphere and the world's tallest arch. Designed by architect Eero Saarinen and completed in 1965, the Arch is a part of the Gateway Arch National Park. It is significantly taller than other iconic U.S. monuments; for comparison, it stands 75 feet taller than the Washington Monument (555 feet) and is more than twice the height of the Statue of Liberty (305 feet). Visitors can take a unique tram system to the top for views of the Mississippi River and the St. Louis skyline. Its stainless-steel, weighted catenary design is an engineering marvel that has made it a symbol of the "Gateway to the West." While there are taller buildings in the U.S., the Gateway Arch remains the definitive leader in the category of dedicated national monuments.