Firenze / Florence Tourist Information What Museum of Opera of Saint Maria of Fiore â‚Ź7 Surprisingly overlooked by the crowds, this museum on the northern (street) side of the cathedral safeguards treasures that once adorned the duomo, Baptistry and campanile. It is one of the city's most impressive museums. Make a beeline for the glass-topped courtyard with its awe-inspiring display of seven of the original 10 panels from Ghiberti's glorious masterpiece the Porta del Paradiso (Door of Paradise), designed for the Baptistry.