It took 76 years to install the 41.5 million pieces of glass into the mosaics adorning the 83,000 square feet of the Cathedral Basilica of Saint Louis. The world’s largest mosaic contains more than 7,000 colors. The word “impressive” is an understatement. The arches supporting the domes have religious scenes ranging from Adam and Eve to the Ascension of Jesus, plus images of American saints.
