The cave churches found in Puglia and Basilicata, two regions in southern Italy, are neither rock-cut nor monolithic. Both rock-cut and cave churches are made of rock but they differ in an important way. Rock-cut churches are cut by man whereas cave churches are carved by nature. Like caves, monolithic churches are built out of a single block of stone. Yet unlike caves, monolithic churches are complex buildings. The cave churches found in southern Italy are simply rupestrian meaning made of rock.