Alcantara Bridge is Roman Bridge which was built around the year 105 A.D. across the Tagus River according to order of the Roman Emperor Trajan in 98 AD. It was an impressive and massive construction of Roman engineers. The framework of the bridge consists of 194 meters length with a 70 meter high central arch, 8 meters wide, 60 meters high and 37 feet depth in the water.
There are six arches on that bridge, three of them are in the water surface and the remaining three small arches are in earth which was constructed by Cayo Lucio Lancer that has been written on a stand stone niche which is at the entry point of bridge. The central arch was named Triumphal arch and a small temple at south end of the bridge as a Roman God which were built to honour the Emperor Trajan. This bridge was built of stones with the granite structure which was build without using the mortar which was renovated in the 19th century and took its name as- Alcantara, which is an Arabic name for bridge. This bridge joins the Roman Caceres with Beira Alta region in Portugal.
The major source of conflict between Spain and the Britain at the time of Peninsula war was the destruction of Roman Bridges at Alcantara. This bridge faced many enormous wars and floods. The bridge was repaired in 1860 which is still in existence and serving for the transportation but only the light motors are allowed to drive over it.The hydroelectric dam which is situated about 1 km east from the Alcantara Bridge facilitates to observe the bridge from upstream. There is also the small car park and observing area at the south bank, next to the small temple, from where the sightseeing of the bridge can be enjoyed clearly.