JFK Stood Here
Philadelphia, Pennsylvania
On July 4, 1962, President Kennedy stood in front of Philadelphia's Independence Hall and gave a speech on "the interdependence of nations," according to the plaque on the ground that marks the spot.
Who cares?
Not many people did -- until Kennedy was assassinated in November 1963. Suddenly Kennedy's Philadelphia stopover became something worth remembering, and the plaque was set in place seven months later, nearly two years after the speech.