Pittsburgh

In 1940 the steelmaking giant was among the top 10 most populated U.S. cities. It now ranks 61st but thrives, thanks in part to a suburban strategy of improved highway networks that support research-and-development hubs in science and medicine.

• 
• Click to Print

• Find this article at:
• https://content.time.com/time/specials/packages/article/0,28804,2030674_2030682_2030676,00.html