Adjoining Church of the Nativity and devoted to Saint Catherine of Alexandria, this Catholic church serves as a Franciscan monastery. Worth visiting for its organ and beautiful stained glass windows. Underground caves can be entered from here.
Wikipedia https://en.wikipedia.org/wiki/Church_of_Saint_Catherine,_Bethlehem
Official Website http://www.bethlehem.custodia.org/default.asp?id=476
Coordinates 31°42'16.414" N 35°12'27.625" E