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The Cathedral of Constantine and Helena welcomes visitors with its elaborate basalt façade, which dates back to the 4th century AD when the former pagan temple was converted into a Byzantine church. Rebuilt in stages, it took its current form in 1865, retaining huge Roman blocks in the south wall as a tangible reminder of the continuity of the ages. Inside, three aisles are separated by cylindrical columns supporting semicircular arches. The structure is topped by a stone vault painted white that reflects the glow of candles at night.
