Summary. Cathedral of Santa Maria del Fiore, also known as the Florence Duomo or Cathedral, is Roman Catholic Cathedral that took well over a century to build. It's Gothic architecture is particularly remarkable with it's green, pink, and white marble lines. For a great view of Florence, climb 463 steps to the top of the Dome. Giotto's Bell Tower, nearly 85 meters high, is similarly offers beautiful views as a reward for your efforts. Note: tickets for both towers must be pu