Not far from the Archaeological Park, off Viale Teocrito, the catacombs below the church of San Giovanni are one of the earliest-known Christian sites in the city. Inside the crypt of San Marciano is an altar where St. Paul preached on his way through Sicily to Rome. The frescoes in this small chapel are mostly bright and fresh, though some dating from the fourth century AD show their age. Open hours may be extended in summer.
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