The Hagia Sophia (meaning Holy Wisdom in Greek) in Thessaloniki, is one of the oldest churches in that city still standing today and it is included in UNESCO's list of World Heritage Sites. About 50 A.D., while on his second missionary journey to Greece, Paul the Apostle visited this place and reasoned with the Jews of the city's chief synagogue on constructing Thessaloniki's first Christian church. Some of Agia Sophia's original mosaics have survived the turbulent history. Those on the dome date from the 9th or 10th centuries and depict the Ascension, with Christ seated on a rainbow throne occupying the central medallion. Below is the Virgin Mary flanked by angels and the Apostles divided by trees.