Aqueduct of Valens
921 metres of Roman arches from 373 AD still stride across a working Istanbul boulevard.
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Completed by Emperor Valens in 373, this bridge was the final link of the longest aqueduct system of antiquity — over 250 kilometres of channels that fed Constantinople. The Byzantines and Ottomans kept it running for centuries after Rome fell. Few Roman structures in any city sit so nakedly in the middle of modern traffic.
What to look for
- The arches crossing Atatürk Boulevard — count the spans as cars pass underneath Roman stonework
- The valley the bridge spans: Istanbul University on one hill, Fatih Mosque on the other — the mosque replaced the Church of the Holy Apostles
- The surviving 921-metre run, about 50 metres shorter than its original length — the truncated end is visible where the arches stop abruptly
Walk Atatürk Boulevard in the Fatih district; the full surviving length is visible from street level with no entry required.
Aqueduct of Valens is one of 39 sights worth the detour in Istanbul, all bundled offline in Voyage GO — download the Istanbul pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Istanbul
- Hagia SophiaCompleted in 537, it held the title of world's largest church for over 500 years — then a mosque, a museum, and a mosque again.
- Constantinople (Istanbul)One peninsula that served as the throne of four empires for sixteen centuries straight.
- Blue Mosque (Sultan Ahmed Mosque)Ahmed I placed it directly opposite Hagia Sophia in 1609 and gave it six minarets — a deliberate challenge to the city's greatest building.
- Topkapı PalaceFor nearly four centuries, the sultans who ruled the Ottoman Empire lived and governed from here — until the court finally moved to Dolmabahçe in 1856.
- ByzantiumGreeks from Megara planted a colony here in the 7th century BC — and the name they gave it eventually became the word for an entire empire.
- Rams Park (Ali Sami Yen Sports Complex)Galatasaray's 53,978-seat fortress on the European side of Istanbul — and the second most eco-friendly stadium on the planet.