Rough black basalt residences of first-century A.D. Capernaum stand in stark contrast to the smooth white limestone of the fourth-century synagogue in the background. Under this synagogue, excavators have found another synagogue made of the same black basalt as the residences in the foreground. The lower synagogue was built on nearly the same plan as the upper limestone synagogue visible here. The walls of the lower synagogue were nearly four feet thick—much thicker than those of these residences—and the walls were made of worked stones, rather than the unworked stones builders used in the residences. The upper synagogue has three entrances on the south, Jerusalem-facing facade. Through these entrances can be seen three rows of columns forming aisles on either side of the prayer hall and the back wall.