 On Sunday , May 25 , 1941 , ground was broken for Mount St. Peter Church . The event was celebrated by the priests of St. Peter 's congregation and about two thousand people showed up to watch . The cornerstone was blessed on Sunday , September 7 , 1941 , by Reverend Alfred Koch , who was the Arch Abbot of St. Vincent in Latrobe , Pennsylvania . Many other priests from the area were also present . Father Paul Tomlinson of St. Peter 's Church in Pittsburgh delivered the sermon in English and <unk> Koch closed the ceremony with the Pontifical Benediction in Italian . The large red cornerstone was made of granite and was fitted with an iron box . The box contained the memorial reports of the congregation , newspapers , American and Papal coins , and medals of the church . The cornerstone was placed so that it can be seen from inside the church . It is located by the altar of the Sacred Heart . 
