The Roman Bridge of Alcántara is a monumental feat of Roman civil engineering, built as an arch over the Tagus River near the town of Alcántara, Cáceres, Extremadura, close to the border with Portugal. Measuring 194 meters in length, 8 meters in width, and with a maximum height of 71 meters (including the central arch), it is considered the tallest Roman bridge in the world and one of the clearest examples of the refined technique and functionality of Roman engineering, with a distinctly propagandistic character dedicated to Emperor Trajan. Its construction of dressed granite ashlar and its symmetrical design—featuring six arches resting on five piers of varying heights, adapted to the terrain—make it a unique structure worldwide due to its dimensions and state of preservation. From the viewing point, one can see the imposing structure spanning the Tagus River, featuring a 13-meter-high triumphal arch on the central pillar, crowning the 8-meter-wide roadway where people can still drive and walk. The bridge was key to the Norba Road, the Via de la Estrella, which linked Norba Caesarina with Emérita Augusta and connected to the Via de la Plata and the Via de Lisboa to Braga, forming part of the network of Roman roads in Hispania. It was declared a National Monument on August 13, 1924, making it a site of cultural interest classified as a monument, and in the 12th century, the Muslim geographer Al-Idrisi mentioned it as one of the wonders of the world. The best time to visit is at sunrise or sunset, when the light highlights the granite texture and the silhouette of the bridge over the river.
