The Roman period water storage cistern building, Apollonia Archaeological Park, Pojan, Albania, Europe

Mosaic Image of Emperor Constantine IX, Interior, Hagia Sophia Grand Mosque, 537 AD, UNESCO World Heritage Site, Sultanahmet, Istanbul, Turkey, Europe

Mosaic Image of Christ Pantocrator, Interior, Hagia Sophia Grand Mosque, 537 AD, UNESCO World Heritage Site, Sultanahmet, Istanbul, Turkey, Europe

Image of Christ Pantocrator, Deesis Mosaic of Christ, Interior, Hagia Sophia Grand Mosque, 537 AD, UNESCO World Heritage Site, Sultanahmet, Istanbul, Turkey, Europe

Image of John the Baptist, Deesis Mosaic of Christ, Interior, Hagia Sophia Grand Mosque, 537 AD, UNESCO World Heritage Site, Sultanahmet, Istanbul, Turkey, Europe

Mosaic, Emperor Justinian on left, the Virgin and Child in center, Emperor Constantine on right, Orea Porta (Vestibule Gate), Hagia Sophia Grand Mosque, 537 AD, UNESCO World Heritage Site, Sultanahmet, Istanbul, Turkey, Europe

The ruins of the ancient Roman and Byzantine city of Bet Shean, Bet Shean National Park, Israel

The ruins of the ancient Roman and Byzantine city of Bet Shean, Bet Shean National Park, Israel

Basilica Cistern is a huge underground Roman water source held up with 336 marble columns, on some of them Medusa heads and decorations covering 9, 800 sq. meters, Istanbul, Turkey

Yerebatan Sarayi Cistern, Istanbul, Turkey

Tourists at Medusa in Yerebatan Sarayi Cistern, Istanbul, Turkey

Tourists at Yerebatan Sarayi Cistern, Istanbul, Turkey

Tourists at Yerebatan Sarayi Cistern, Istanbul, Turkey

Yerebatan Sarayi Cistern, Istanbul, Turkey

Tourists at Yerebatan Sarayi Cistern, Istanbul, Turkey