At Patù (near Torre San Gregorio), at the opposite of the Romanesque church of San Giovanni, you can see the Centopietre, a small (7x5.5m) rectangular structure of large ashlars with a pitched roof. Maybe the building was Messapian in origin, but some think that it was built during the Middle Ages, using stones belonging to earlier buildings.
The coast, is also distinguished by rocky bays, many dominated by medieval watch-towers. Beyond Sant'Antonio, the road is straight and somewhat monotonous. Near Marina San Giovanni lie the scanty remains of the Roman harbour of Usentum. Beyond the 16C Torre Suda (left) a road on the right leads inland to Taviano and Casarano, birthplace of Pope Boniface IX (reigned 1389-1404). The church of Casaranello (or Santa Maria della Croce) contains the only known early Christian mosaics in Apulia. It consists of an ancient building, initially comprising a single nave, that was enlarged during the late Middle Ages and remodelled in the 11C, 13C and 17C. The mosaics occupy the vault of the chancel and the cupola; in the former are geometric designs with animals; in the latter, the Cross set against the night sky. Along the nave walls are 13C frescoes representing the life of St Catherine and New Testament scenes.