The church of Santa Maria del Carmine
To the right of the church, through the cloister: the Brancacci Chapel and its frescoes by Masaccio.
The church of Santa Maria del Carmine stands on Piazza del Carmine, which you can reach from the Duomo (cathedral) by taking Via Roma and the streets that continue it, Via Calimala and Via Por Santa Maria. Cross the Ponte Vecchio to reach Piazza de' Pitti, which you cross. Then turn right into Via Mazzetta until you reach Piazza Santo Spirito, then continue along the extension, Via Sant'Agostino and then Santa Monaca, which opens onto Piazza del Carmine.
Address: Piazza del Carmine
The exterior facade, as often in Florence, was never finished.

The interior dates essentially from the 18th century and has a Latin-cross plan with a single nave bordered by chapels, and a transept crowned by a dome. A fire in 1771 almost entirely destroyed the interior decoration. The present vault is decorated in trompe-l'oeil. The Corsini chapel was built in 1675 in honor of Saint Andrea Corsini, who had just been canonized. The altarpiece and the ceiling in the Baroque style miraculously escaped the fire.
You will also find a pretty cloister of the 17th century.

See also: the Brancacci Chapel, entrance to the right of the church, crossing the cloister.