The parish church of San Martino Sopr'Arno is a sacred building of Capolona that is located in the town of the same name, on a hill near the Arno River; it is not excluded that in its surroundings there was a cult in Bacchus, since near the Valiano stream there is the 'Campo di Bacco' (Bacchus' field). Its titling suggests an early medieval origin.

Documented since 1017, it was part of the possessions of the canons of the Church of Arezzo. Mostly renovated in the 19th century, only the semicircular apse, corresponding to the chapel containing the altar of the Immaculate Conception, and the terminal wall remain of the probable three-nave basilica structure.

Its masonry structure is made of regular blocks of sandstone, on which two small medieval loggia windows open. The modest 19th century facade is in gabled stone style; the bell tower in the tergal part it is in sail shape with tmullioned windows, bells and a third empty fornix.
The parish church was originally isolated, as its village was probably the one in front, now called Le Caselle, whose settlement shows signs of ancient settlements.