Situated in Spain's Extremadura Founded in AD 104–106 Price: Not available for historical data The Alcántara Bridge in Extremadura, Spain, dates back to the Roman Empire and is a marvel of ancient engineering skill and innovation. This stone arch bridge, which was first built between AD 104 and 106, crosses the Tagus River to link the present-day cities of Alcántara and Alconétar. Standing at 71 meters in height and 194 meters in length, it was an essential part of the ancient Roman Via de la Plata.
