heinzhistorycenter.org

6EkZZ TIL the earliest known site of human habitation in North America (at 19,000 years old) is a short drive from Pittsburgh, Pennsylvania. It was discovered in 1955 because of a groundhog hole.
MekO8 TIL Pittsburgh, PA, USA, due to being situated between three rivers, has the most bridges within city limits in the world, at 446