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1953-Squirrel-Hill-Tunnel.jpg
Pittsburgh PA:  View of the opening of the Squirrel Hill Tunnels in 1953.  At the time, this was the most expensive project under taken by Pennsylvania Department of Transportation - $18M. Construction started and 1946 and was completed in 1953.  The tunnels are nearly 1 mile long but most people would say it was much longer if you ever were in AM or PM rush hour traffic.