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Photo: via Wikimedia Commons, CC BY-SA 3.0
Some modest remains amidst the square.
The Amphitheatre of Catania is a Roman amphitheatre in Catania, Sicily, Southern Italy, built in the Roman Imperial period, probably in the 2nd century AD, on the northern edge of the ancient city at the base of the Montevergine hill. Only a small section of the structure is now visible, below ground level, to the north of Piazza Stesicoro. This area is now the historic centre of the city, but was then on the outskirts of the ancient town and also occupied by the necropolis of Catania. The structure is part of the Parco archeologico greco-romano di Catania.
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A Baroque villa. It hosts Faculty of Law of the University.
Walk the main shopping avenue, running north from the Piazza del Duomo has most of the city's imposing building and is busy throughout the day and evening. Lots of churches. This road is the equivalent of Las Ramblas in Barcelona, so in the evenings the local people put on their Sunday clothes and walk at a relaxed pace along this avenue.
It's a centre of an ecclesiastical architecture in Catania: in no more than 200 m there are 4 churches, 3 monasteries and a college.
Four Corners