One of the oldest towns in Portugal (founded in 1125), Ponte de Lima was historically significant as a Roman settlement on the road from Braga to Santiago de Compostela and Lugo, and the first place in Portugal getting a municipal charter.
The main symbol of Ponte de Lima, that together with the river names the town, is its bridge. In reality, it’s a composite formed by two bridges: a medieval part, which is bigger, starting on the left bank of the river and stretching to the church of Santo António da Torre Velha and beyond, for the length of two more arches. After that, starts the roman part of the bridge. It is only five arches long, starting from the big arch already lying on the old, dry riverbed.
Going down the stairs, one will also see the foundation of the Old Tower, maybe the first of the old medieval defensive system. The Roman bridge, presumably, dates back to the 1st century since that is the age that witnessed the opening of one of the Roman military ways of the Conventus Bracaraugustanus, connecting Braga to Astorga, more exactly the Via XIX, opened by Emperor Augustus.
Regarding the medieval part of the bridge, although one can go back in time, at least until the reigns of Pedro I and Fernando (that directly connect to the construction of the walls and towers that fortified the town, finished by 1370) or even King Dinis (according to the documents mentioning a bridge that could also have been made of wood) we definitely know about the existence of the medieval bridge during the reign of Manuel I, more exactly in 1504, as this monarch ordered the new paving of the bridge and its decoration with battlements that were no longer necessary as a defensive and military option.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.