ISTANBUL, TURKEY - AUGUST 1: Aqueduct of Valens on August 1, 2011 in Istanbul, Turkey. Aqueduct was completed in 368 by Roman Emperor Valens. Today,  busy Ataturk boulevard leads under its bridge.
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ISTANBUL, TURKEY - AUGUST 1: Aqueduct of Valens on August 1, 2011 in Istanbul, Turkey. Aqueduct was completed in 368 by Roman Emperor Valens. Today, busy Ataturk boulevard leads under its bridge.