Piazza del Duomo is the main city square in Catania, Italy, flanked by both the centers of civic and religious power. The Duomo di Catania or Cattedrale di Sant'Agata stands on the east side of the square. Originally constructed in 1078–1093, on the ruins of an ancient Roman Thermae, like nearly all of Catania, the devastating 1693 earthquake, leveled most …Piazza del Duomo is the main city square in Catania, Italy, flanked by both the centers of civic and religious power. The Duomo di Catania or Cattedrale di Sant'Agata stands on the east side of the square. Originally constructed in 1078–1093, on the ruins of an ancient Roman Thermae, like nearly all of Catania, the devastating 1693 earthquake, leveled most of the structure, and Giovanni Battista Vaccarini designed a Baroque structure and façade in 1711.