Question: How tall is this monument in St. Louis built after the Apotheosis of St. Louis, which became an international symbol for the city?
Sentence (from "Gateway Arch"): 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.
Relevant evidence: No