The Church of Panagia Chalkeon — "Our Lady of the Coppersmiths" — stands in Dikastirion Square right in the commercial centre of the city, a compact brick cube of Byzantine architecture dating from 1028. It is one of the better-preserved middle Byzantine churches in Thessaloniki and one of the few where the original dedication and date of construction are known from an inscription above the entrance.
The interior is small and dark, with original frescoes still visible in the apse and on the walls, worn but recognisable. The church is active and still holds services. Outside, the square around it is a pleasant break from the noise of the central market — the name recalls the coppersmiths who worked in stalls surrounding the church during the Ottoman period, their trade long gone but the name fixed permanently to the building.