The Church of Saint Demetrius is a historic Orthodox church located in Thessaloniki, Greece. Built in the 7th century, it is dedicated to Saint Demetrius, the patron saint of the city. The church is renowned for its stunning Byzantine architecture and intricate mosaics, reflecting the artistic achievements of the era. This church has significant cultural and religious importance, serving as a pilgrimage site for many believers. It was designated a UNESCO World Heritage Site in 1988, highlighting its value in the context of Byzantine heritage. The Church of Saint Demetrius continues to attract visitors for its beauty and historical significance.