"The high point so far has been the discovery between two windows of a mosaic angel that had been covered over with plaster following an earthquake in the 1830s. The angel - the seventh in a sequence of angels walking toward the site of the Nativity - emerged after restorers using thermographic cameras noticed..."
http://www.cbsnews.com/news/church-of-the-nativity-in-bethlehem-restoration-halfway-done/