Pope Francis celebrates Christmas Mass in St. Peter's Basilica Dec. 24, 2020. / Vatican Media.Greccio, Italy, Dec 17, 2021 / 04:00 am (CNA).In 2019, Pope Francis issued an apostolic letter on the meaning and importance of the Christmas nativity scene. He signed the document, Admirabile signum ("Enchanting image"), on Dec. 1 that year, at the Shrine of the Nativity in Greccio, a hilltown in the Italian region of Lazio. The choice of Greccio was significant, because it was there in 1223 that St. Francis of Assisi created history's first nativity scene.In the apostolic letter, wide...