Church of Panagia Chalkeon

The Church of Panagia Chalkeon is an 11th-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 was converted to a mosque in the 15th century, during the Ottoman era, and subsequently reconsecrated as a church in the 20th century.