On the anniversary of the laying of the cornerstone of Florence Cathedral on September 8, 1296, the Opera di Santa Maria del Fiore is pleased to share a special day of celebration:the Opera del Duomo Museum will be open free of charge, without need of reservations or tickets, from 8:30 AM until midnight (last admission at 11:00 PM), offering everyone the opportunity to discover the works and masterpieces from the monumental complex of Piazza Duomo.