On your right, look for a compact square building of dark lava stone and pale limestone, crowned by a broad round dome and marked by an old pointed portal cut into the wall.
This quiet little mass is one of Catania’s great acts of disguise. It began life as a Roman bath complex, built between the first and second centuries after Christ, then enlarged in the third century when the city grew richer and more ambitious. Beneath the later church lay the machinery of Roman comfort: a large apsed hall, probably a frigidarium, or cold room; heated chambers with a hypocaust, the Roman underfloor heating system where hot air moved beneath floors carried on small brick supports; and even a pair of small circular rooms that may have served as steam rooms or saunas.
Then the city changed its mind about what this place should be.
Near the end of the sixth century, in the Byzantine period, people turned the abandoned baths into a church: Santa Maria della Rotonda. That alone makes this site precious. Along with the Bonajuto Chapel, it preserves one of the very few surviving traces of Byzantine Catania. The name Rotonda comes from the church’s striking form: a circular inner hall, about eleven metres across, covered by a full dome, all enclosed within a square outer shell. A Roman place for bathing became a Christian place for prayer, and later, from the ninth century onward, the ruins around it filled with graves. Medieval gravediggers even broke through grand Roman marble paving to make burials. In this city, one age rarely clears away another. It simply settles on top and carries on.
Now, here is the detail locals once repeated with enormous pride. For centuries, many Catanesi insisted this was not a bath at all, but their own ancient Pantheon. Some even claimed it came before the Pantheon in Rome and served as its model. Antiquarians such as Giovanni Battista de Grossis and Ottavio D’Arcangelo helped keep that story alive in the seventeenth century. The legend grew bolder still: people said Saint Peter himself passed through Sicily in the year forty-four and consecrated this former pagan temple to God and the Virgin Mary. None of that stands up to archaeology, but it tells you something revealing about Catania. The city did not merely inherit antiquity; it wanted to outshine Rome with it.
The man who first pulled the story back toward fact was the Prince of Biscari. In the eighteenth century, he looked carefully at the structure and recognised it as part of a Roman thermal complex. He was right in essence, though modern excavations between two thousand and four and two thousand and eight, and again in two thousand and fifteen, sharpened the picture further: archaeologists identified nine bath rooms, found many tombs, uncovered a large water reservoir linked to the Roman aqueduct, and revealed the old northern approach courtyard.
One last twist. After the bombing of nineteen forty-three damaged the area, Guido Libertini led restoration work here. He exposed important Roman remains, yes, but he also tore away church fittings and destroyed many later frescoes in his zeal to reveal the ancient core. Even restoration, here, became another layer of loss and reinvention.
From this converted shell of baths and legend, we now head to the vast scale of San Nicolò l’Arena, where monastic ambition swells to the size of a city. If you want to return inside later, it is usually open Tuesday through Saturday from nine to five, Sunday from nine to one, and closed on Monday.
