Question: What popular tourist destination was built in the 1960's in the city that had the Pruitt-Igoe complex?
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