Leave Florence for some hours and travel through the beautiful Tuscan countryside to reach Pisa.
Discover the Square of Miracles, whose name comes from a poem by Gabriele D'Annunzio, who considered these monuments "miracles". Here you will see the Baptistery (exterior) and then visit the Cathedral. Climb the stairs of the Leaning Tower and when you reach the top admire the view over the gorgeous square. The Tower is actually considered a part of the Cathedral because it was built as its bell tower.
You will have some free time to explore the square on your own at the end of the guided visit: take pictures, go souvenir-hunting or just take a break and relax on the green lawn that surrounds the square before coming back to Florence.