Serres is a modern city, the capital of the prefecture of Serres, about 70 km north-east of Thessaloniki,
situated in the plain under the Rhodope Mountains. The city was mentioned by the Greek historian
Herodotus as Siris in the 5th century BC. The city was the site of a major fortress built by the Byzantine
Empire to guard the empire's northern frontier.
First exploration of the city, Eleftheria Square, the pathway to the pine-filled hill Koulas overlooking the city, Byzantine church od Agios Nikolaos, the Acropolis, ruins of the castle.
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