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Paleochristian and Byzantine Monuments of Thessalonika

Founded in 315 B.C., the provincial capital and sea port of Thessalonika was one of the first bases for the spread of Christianity. Among its Christian monuments are fine churches, some built on the Greek cross plan and others on the three-nave basilica plan. Constructed over a long period, from the 4th to the 15th century, they constitute a diachronic typological series, which had considerable influence in the Byzantine world. The mosaics of the rotunda, St Demetrius and St David are among the great masterpieces of early Christian art.

http://whc.unesco.org/en/list/456

The Paleochristian and Byzantine Monuments of Thessalonika are a group of religious monuments known for their mosaics and distinct architectural typology.

Thessaloniki is Greece's second largest city, situated in the northeast, in Macedonia prefecture. During its heydays, in the Byzantine period, it was also the empire's second city (to Constantinople, in that case). 

Thessaloniki derives its name from the first daughter of King Philip of Macedon. She married Kassandros, Alexander the Great's general who succeeded him on the throne. He gave her name to the city he founded around 316 B.C. 

http://www.worldheritagesite.org/sites/thessalonika.html