The origins of Puente del Congosto Castle dates from the 12th and 13th centuries. It was built for defensive reasons, to control the route which connected Ciudad Rodrigo with Avila.
In 1393, Enrique III granted the manor of the Puente del Congosto to Gil Gonzalez Davila, which rebuilt the castle, which would be Posada Real. The Duke of Alba bought the castle to the Emperor Carlos in 1539, adding to the rectangular tower the large cube gives to the building most uniqueness.
The castle is in a good state of conservation. It is made up of an outer enclosure and an inner fortification formed by a great rectangular keep with a second tower build against it.
The outer enclosure is an irregular rubblework hexagon, reinforced in the corners by granite ashlars. Because it is more vulnerable than the others, the western curtain wall of the outer enclosure is extra protected with a small tower in its center. The gate is situated in the northern wall and is protected by another wall. There is also a postern in the eastern wall on a higher floor level.The keep is made up of two great halls with brick vaults sustained by arcs of ashlar masonry. In the lower hall, on a height of about 3 meters in the western wall, is the entrance to the spiral staircase that leads to the upper hall. In the eastern wall is a little window. The top of the keep was originally crenelated.The ground floor level of the second tower is only the one that can be accessed from the courtyard. All the higher floor level in this tower can only be accessed through wall staircase from the keep.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.