Medusa Head, Byzantine Basilica Cistern, Sunken or Underground Palace, Sultanahmet, Istanbul, Turkey, Europe

Interior of Basilica Cistern, Sultanahmet, Istanbul, Turkey, Europe

Basilica Cistern, Sultanahmet, UNESCO World Heritage Site, Fatih District, Istanbul Province, Turkey, Europe

Basilica Cistern, Sultanahmet, UNESCO World Heritage Site, Fatih District, Istanbul Province, Turkey, Europe

Basilica Cistern with green illumination, Istanbul, Turkey, Europe

Basilica Cistern with an orange illumination, Istanbul, Turkey, Europe

Basilica Cistern with an orange illumination. Istanbul, Turkey, Europe

Basilica Cistern with an orange illumination, Istanbul, Turkey, Europe

Basilica Cistern with green illumination, Istanbul, Turkey, Europe

Basilica Cistern columns, Istanbul, Turkey, Europe

Basilica Cistern (Yerebatan Sarayi) (Sunken Palace), Istanbul, Turkey, Europe

Water reflecting columns at Basilica Cistern (Sunken Palace) subterranean water system underground, Istanbul, Turkey, Europe

Basilica Cistern, Istanbul, Turkey, Europe

Basilica Cistern, Istanbul, Turkey, Europe

Monumental head of a medusa, upside down, Yerebatan Sarayi, Byzantine cistern, Sultanahmet, Istanbul, Turkey

Cistern in front of the Basilica Santa Maria delle Pieve, the Palazzo del Tribunale, the Palazzo della Fraternita dei Laici, the Palazzo delle Logge, and the Piazza Grande, Arezzo, Tuscany, Italy, Europe

Monumental head of a medusa at the foot of a column, Yerebatan Sarayi, Byzantine cistern, Sultanahmet, Istanbul, Turkey

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