section_path: Arts/Architecture
section_name: Architecture
paragraph_text: Architecture
  
  Influences from Byzantine architecture, particularly in religious buildings, can be found in diverse regions ranging from Egypt and Arabia to Russia and Romania. Byzantine architecture is known for the use of domes, and pendentive architecture was invented in the Byzantine Empire. In contrast to the basilica plans favored in medieval Western European churches, Byzantine churches usually had more centralized ground plans, such as the cross-in-square plan deployed in many Middle Byzantine churches. They also often featured marble columns, coffered ceilings and sumptuous decoration, including the extensive use of mosaics with golden backgrounds. Byzantine architects used marble mostly as interior cladding, in contrast to the structural roles it had for the Ancient Greeks. They used mostly stone and brick, and also thin alabaster sheets for windows. Mosaics were used to cover brick walls and any other surface where fresco would not resist. Notable examples of mosaics from the proto-Byzantine era are at the Hagios Demetrios in Thessaloniki (Greece), the Basilica of Sant'Apollinare Nuovo and the Basilica of San Vitale, both in Ravenna (Italy), and the Hagia Sophia in Istanbul. Christian liturgies were held in the interior of the churches, the exterior usually having little to no ornamentation.