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Photo: C messier, CC BY-SA 4.0 via Wikimedia Commons
Baths from the 12th/13th century that functioned continuously until 1940.
The Byzantine Bath of the Upper City in Thessaloniki is one of the few and best preserved of the Byzantine baths that have survived from the Byzantine period in Greece. It is located on the Theotokopoulou Street in the Upper Old Town of Thessaloniki.
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Vlatadon Monastery
A monastery built in the 14th century.
A 14th-century church, particularly worth a look for its well-preserved frescoes. See if you can spot one of the turtles in the garden.
A 14th-century church. Fragments of the church's original wall paintings survive.
Agios Demetrios
Constructed in the mid-7th century on the ruins of a Roman bath complex, in honor of Demetrius, a Roman officer who was imprisoned and martyred here in 303 AD. An earlier small church, built on the site of martyrdom, burned down during the earthquake of 620 and a new large basilica was erected at expenses of Leontius, the Byzantine prefect of Illyricum and the Bishop of Thessaloniki. The new church of S. Demetrios became one of the most famous centres of pilgrimage for Orthodox Christians until its Muslim conversion in 1492. In the Great Fire of Thessaloniki of 1917 the basilica was gutted. The work of restructuring the church lasted fifty years. Most of the ancient mosaics in the western wall and in the inner central aisle survived the heat from the fire.
The house where Mustafa Kemal Atatürk was born.
Ancient Agora
Excavations and an interesting museum underneath.