The Transfiguration of the Saviour and Diocese of Syros is a temple monument built in 1824 by refugees of Psara and Chios in an uphill road near the city hall of Ermoupolis.
It is a three-aisled Basilica with a dome and two bell towers which among other things hosts the Bell of St. Nicholas of Psara and various relics carried by the refugees. It stands out for its stunning design resembling the Church of our Lady in Tinos, the black-and-white mosaic in the courtyard, the historic arcade at the entrance that has now been sealed and is only distinguished by the original inscription, the decorative painting, the wood carvings, the old icons, the ecclesiastical furnishings and exquisite samples of hagiography of the 19th century.
In the western part of the courtyard area is the burial place of Anthimos Gazis and right by the Church it is worth visiting the ecclesiastical Museum which hosts sacred vessels, books and manuscripts.