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Near the Basilica Cistern, is a fragment of the original monument, the Milion Stone.

In the early 4th century, Emperor Constantine I the Great built the zero-mile marker on the road which led from Istanbul (Constantinople) to Rome. This became the starting-place for measuring the distances of all roads leading to important foreign cities.

 

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The Milion Monument was the starting point of the great Roman road Via Egnetia that lead to European cities and the reference point for measuring all distances on it.

 

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Yes, I found New York listed, only 8,088 km away!

 

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The Milion Stone is located across the street from Hagia Sophia.