Ospedale del Ceppo
Founded in the 13th century, this still-functioning hospital has a facade with a superb early-16th-century exterior terra-cotta frieze. It was begun by Giovanni della Robbia (1469–1529) and completed by the workshop of Santi and Benedetto Buglioni between 1526 and 1528. Don't miss the 17th-century graffiti on the columns outside.