Leonardo da Vinci painted "The Last Supper" straight on a dry plaster wall in the dining room of the Santa Maria delle Grazie in Milan, Italy. Leonardo da Vinci painted this masterpiece instantly onto a plaster wall within the 1490s. Can you title the religion? Which religion does it belong to? People of every religion and no religion have heard of St. Peter's Basilica. It is the most important church in Italy, however St. Peter's Basilica (the most important on the earth) sits in the country o...