24 hours in Florence? The city is worth rather more, but you can at least get some idea of it. With a single day at your disposal you will want to see the chief monuments and walk around the “heart” of the city centre.
You start with Piazza del Duomo, facing the cathedral of Santa Maria del Fiore, begun by Arnolfo di Cambio in 1296 but only in 1436 crowned with the masterpiece of Filippo Brunelleschi. His Cupola (dome) is the symbol of Florence, a daring and majestic structure from the top of which you will get a wonderful panoramic view of the city, and also of the interior of the cathedral.