by-grace-of-god:

Cathedral Basilica of Saint Louis – 20
different artists covered 83,000 square feet with mosaics (41.5 million
pieces of glass). Mosaics started in 1912 and were completed in 1988.

Photo sources: 1, 2, 3, 4, 5, 6, 7, 8,

See: photos part 2

See also: 360 degree panoramic views