This cache brings you to the old PI-62 Nike Missile Air Defense System Complex and a budding new brewery.
"Pittsburgh Defense Area (PI): At first, three active Army battalions manned the ring around "Steel City". Later manning responsibilities would eventually be supplied by one active duty unit (3rd Missile Battalion, 1st Artillery) and one Pennsylvania Army National Guard battalion (The Duquesne Greys-2nd Missile Battalion, 176th Artillery). Operations at five of these Nike Hercules sites lasted until 1974."
https://en.wikipedia.org/wiki/List_of_Nike_missile_sites#Pennsylvania