Acueducto de los Milagros, or Aqueduct of Miracles, built in the 1st century AD to transport water from the Proserpine Reservoir 5km away, to Emerita Augusta, founded in 25 BC by Emperor Augustus, in Merida, Extremadura, Spain. Pillars built in stone are connected by 3 brick arches, and the structure is 25m high at its highest point. It forms part of the Merida UNESCO World Heritage Site. Picture by Manuel Cohen
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