Thanks to Google, you can search their IMAGES for items that have been added from the Life Magazine collection. While checking out pictures of Cleveland players, Corvettes and more, I found a picture of Pittsburgh before it was "Pittsburgh:"
Notice they had just cleared out a bunch of warehouses and such, getting ready for Point State Park to come in! The fountain isn't even erected in aother photo I found of this same time period. Notice the bridge on the right is just pillars! And the bridge on the left is nothing yet!
Here is a more modern view of the city of bridges:
Very cool walk down nostaligia lane, for sure. Not that I was around in '55. Heck, I wouldn't show up for another 14 years!