What popular tourist destination was built in the 1960's in the city that had the Pruitt-Igoe complex?
History of St. Louis (1905–80):  The city became home to the Jefferson National Expansion Memorial during the 1930s, and during the 1960s the Gateway Arch was built on the memorial grounds. Gateway Arch: The Gateway Arch is a 630 ft monument in St. Louis in the U.S. state of Missouri. Gateway Arch:  Built as a monument to the westward expansion of the United States, and officially dedicated to "the American people," it is the centerpiece of the Jefferson National Expansion Memorial and has become an internationally recognized symbol of St. Louis, as well as a popular tourist destination.
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