Since the Great Depression, the Rockettes have shared Radio City Music Hall with live farm animals — from camels to donkeys to sheep — to stage a live nativity scene for its annual "Christmas Spectacular." But the world saw its first living nativity in 1224, when St. Francis of Assisi re-created the birth of Jesus to explain the holiday to his followers. During that first display, the manger was also used as an altar for Christmas Mass.