Marialva Castle is one of the most singular ruins of Portuguese castles. The line of walls interrupted by two wickets and two gates (the gate of the Guardian Angel and the gate of Monte) hide a cluster of ruins: the Paçom Alcáçova, the Town Hall, the Jail and the Court, as well as the pillory, the cistern, the Keep, two churches and five towers.

This house is said to have belonged to Lord Wellington, who set up his barracks here during the French Invasions. It is symbolic of the façade on which are the coat of arms, the plaque and the moulded door.

A construction attributed to King Dinis, it has now been converted into a cemetery.

Also referred to as the Castelo das Cinco Quinas (Castle of the Five Corners), due to the unusual shape of its pentagonal keep, it is believed to have been commissioned by King Dinis at the same time as he granted it its charter at the end of the 13th century. It served its military function once in a while, but also as a prison, having been abandoned and its walls dismantled for the construction of several houses in the town and the castle's square of arms began to serve as a cemetery, all this in the 19th century, and only in the 1940s of the 20th century was it possible to stop this degradation.