The Alcántara Bridge in Alcántara, Spain, is a remarkable example of ancient Roman engineering and architecture. Constructed between AD 104 and 106 during the reign of Emperor Trajan, the bridge spans the Tagus River and was designed by the Roman architect Caius Julius Lacer. Made of stone, the bridge is notable for its six symmetrical arches and its overall length of approximately 194 meters (636 feet). It stands as a testament to the ingenuity and durability of Roman construction techniques, remaining in use for vehicular traffic to this day.
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