A few minutes’ walk from Manger Square in Bethlehem is an underground chapel that for nearly 2,000 years has been the site of a sanctuary, said to contain rock made miraculous through the spilling of the Virgin Mary’s milk on it. Louise Cowley investigates This Christmas, more than 75,000 tourists will celebrate the birth of Jesus Christ by visiting the Church of the Nativity in Bethlehem. Lesser known but still considered miraculous are the 3,000 births of babies by women considered infertile, attributed to consuming the powder ground from rocks of the nearby Milk Grotto.According to tradition, before fleeing to Egypt, the Holy Family took refuge in a cave, where drops of the milk of the Virgin Mary fell on the ground and turned the rock white. Many believe that the rock is