A man works on the excavation of an ancient site under the city centre of modern Thessaloniki, on April 25, 2018. A 15-year subway project in Greece's northern metropolis, scheduled to be completed in 2020, has shed light on unknown facets of daily life in the 2300-year-old city's history. The excavation has turned up over 300,000 items of importance including 50,000 coins, in addition to an entire early Christian church. Thessaloniki was an important hub of the Roman empire and later became the second city of the Byzantine empire. / AFP PHOTO / ARIS MESSINIS