The Cathedral of Santa Maria del Fiore in Florence, Italy, is a massive Gothic-style church that started being built in 1296 and was finally completed in 1436. It's famous for its impressive dome designed by Filippo Brunelleschi. The exterior features colorful marble panels and a stunning Gothic Revival façade. This iconic cathedral, along with the Baptistery and Giotto's Campanile, is a UNESCO World Heritage Site and a must-visit attraction in Tuscany. It's one of Italy's largest churches and boasts the largest brick dome ever constructed.