Thessaloniki is a port city of Greece located on the Thermaic Gulf of the Aegean Sea. Traces of the passage of Romans, Byzantines and Ottomans still remain today in the upper town (Ano Poli). The Rotonda is part of the ruins of the palace of the Roman Emperor Galerius, dating back to the 4th century, and has been used over time both as a church and as a mosque. Most of the city center was destroyed in the Great Fire of 1917. The area rebuilt in the 19th century has the appearance of a modern European city.

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