The most spectacular art treasures of the church are its gorgeous Byzantine mosaics, glittering Old Testament scenes high on the walls (don't forget the binoculars), and a triumphant Mary and Jesus enthroned in the apse over the high altar.
There are a number of Byzantine mosaics inside the church.
Wadi Natrun was one of the most important areas of Egypt in ancient times, primarily because it was the main source of the mineral natron used in the mummification and glassmaking processes.