Chartres Cathedral (France) - Chartres Cathedral was built under the 'Cult of the Virgin Mary.' The cathedral is filled with mysterious light, and attracts many pilgrim worshippers. Construction of Chartres Cathedral, the symbol of French Gothic architecture, began in the 12th Century and was completed in the 13th Century. Adorned with two towering steeples, colorful stained glass windows that retain their original appearance, and Gothic style sculpture, the cathedral holds a very important place in the history of art. Paleochristian and Byzantine Monuments of Thessalonika (Greece) - Byzantine and early Christian monuments have long been watching the march of history in Thessalonika, a city where long ago the apostle Paul once carried out missionary work. In the Byzantine era, the city of Thessalonika in northern Greece prospered as the second most important city of the Byzantine Empire after Constantinople. The city is home to a large number of Byzantine and early Christian monuments, including the Church of Saint Demetrius, the Church of Agia Sofia, and the Church of the Holy Apostles.