Despite its beauty and imposing scale, there's a chance you might never have heard of the Segovia Aqueduct, but it's by far the best-preserved Roman aqueduct in the world. The structure spans an incredible 8.6 miles and was built during the 1st century AD to transport water from the Frio River to the Spanish city of Segovia. Added to the UNESCO World Heritage List in 1985, the aqueduct has become the prime symbol of Segovia, even featuring on the city's coat of arms.

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