The Church of Panagia Chalkeon is an 11th-century Byzantine church located in Thessaloniki, Greece. It was built in the early 11th century, during the rule of Emperor Basil II. The church is famous for its unique architecture and impressive decorations.

The exterior of the church is relatively simple, with a brickwork design that creates a cross-shaped pattern. The interior, however, is decorated with magnificent frescoes that cover almost every inch of the walls and vaults. The frescoes are a masterpiece of Byzantine art and represent scenes from the life of Jesus, the Virgin Mary, and the saints.

One of the most impressive features of the church is the dome, which is decorated with a beautiful mosaic of the Virgin Mary holding baby Jesus. The mosaic is surrounded by four archangels, each one depicted in a different pose.

The Church of Panagia Chalkeon has undergone several renovations over the centuries, but the frescoes and mosaics have remained intact. Today, the church is a popular tourist attraction and a designated UNESCO World Heritage Site.