Paleochristian and Byzantine Monuments of Thessalonika

The Paleochristian and Byzantine Monuments of Thessalonika are a serial collection of churches, baptisteries, chapels and monuments in Greece’s second city, inscribed for their representation of early Christian and Byzantine architecture and mosaic art. The group spans roughly the 4th to the 14th centuries and illustrates the city’s role as an imperial and ecclesiastical centre.

Key highlights include the Rotunda, a 4th-century monumental circular building later used as a church, and Hagios Demetrios, the city’s principal basilica with an important martyrial crypt and mosaics. Visitors also see the Hagia Sophia of Thessaloniki and the Acheiropoietos Basilica, each retaining significant architectural plans and mosaic decoration; many monuments display mosaic panels, marble revetments and early Christian iconography. The monuments are clustered within the old urban core, allowing walking itineraries that link multiple sites within short distances.

Thessaloniki developed as a major imperial city of the late Roman and Byzantine worlds; its churches and monuments were built across several centuries under imperial and local patronage and adapted over time through restorations and reconstructions. The surviving fabric documents changes in liturgical practice, architectural form and decorative programs from late antiquity through the middle Byzantine period.

The sites are located in the historic centre of Thessaloniki, in northern Greece, close to the waterfront and within walking distance of the modern city centre. Thessaloniki serves as the regional hub of Central Macedonia and is accessible by road, rail and an international airport.

• Date range and significance: The serial property includes major early Christian and Byzantine monuments in Thessaloniki dating from the 4th to the 14th centuries and notable for surviving mosaics and architectural plans.
• Active religious use: Several monuments remain in continuous liturgical use and conservation balances active worship with preservation of historic fabric and mosaics.

What to See #

• The Rotunda: A late-antique and early Byzantine rotunda originally built in the 4th century as a Roman mausoleum or temple and later converted to Christian use; it contains early mosaics and was closely associated with imperial patronage.
• Hagios Demetrios: A major Christian basilica dedicated to the city's patron saint, Demetrios, with surviving Byzantine mosaics and an important martyrial crypt dating to the early Byzantine period.
• Hagia Sophia (Thessaloniki): A large cathedral church, rebuilt in the Byzantine period, notable for its cross-in-square plan and historic mosaics dating from the 8th-12th centuries.
• Acheiropoietos Basilica: An early Christian basilica dating to the 5th century, retaining substantial early masonry and liturgical features and representing the city's early Christian urban fabric.