Church of the Holy Apostles, Thessaloniki

The Church of the Holy Apostles is a 14th-century Byzantine-era Greek Orthodox church in the city of Thessaloniki, in the Central Macedonia region of northern Greece. Because of its outstanding Byzantine mosaics and architecture, and its testimony to the importance of Thessaloniki in early and medieval Christianity, the church is one of fifteen structures inscribed on the UNESCO World Heritage List as the Paleochristian and Byzantine monuments of Thessaloniki. The church is located at the start of Olympou Street, near the city's western medieval walls; was converted to a mosque in the 16th century, during the Ottoman era, and subsequently reconsecrated as a church in the 20th century.