This castle has a rectangular plan and initially it was reinforced by eight semicircular towers with square plan keep. It is placed on a hill at 45 metres high from where it is possible to see São Martinho do Porto Bay.

Occupied by the Romans in the mid-2nd century, it was transformed into a political and administrative center, conquered by the Moors in 713 and taken over by the Portuguese crown in 1248. The castle was restored by Dom Dinis. The walls are made of rammed earth with battlements and a walkway that communicates with the watchtower. Traces of sections of the wall, the entrance turret and, inside, the ruins of a church with Gothic and Manueline traces remain.

Salir might have been the place where D. Paio Peres Correia awaited the arrival of D. Afonso III, so that together they could undertake the conquest of what remained in the province in the hands of the Moors. During the time of King Afonso III, this location became a stronghold, giving the castle a privileged role in the definitive conquest of the Algarve. It is presumed that the castle was burned down and rebuilt twice, and today only ruins of its walls remain.

This Monument from the 15th century, these days is in ruins. It has a board with a written poem from the Engineer Mário Cruzeiro.

Templo enquadrado na malha urbana, de arquitetura medieval e que apresenta arcos ogivais. Funciona como núcleo museológico, permitindo aos visitantes conhecer as vivências da comunidade judaica que aqui viveu e os contributos dados para o desenvolvimento da vila.

What is left of the castle and the walls shows the importance it had at the time of the moorish occupation, be it for the dimensions of the walls, be it for the artistic and archeological importance of the identified materials.

All that remains of the original medieval fortification is the keep, part of the 12th century fortress, part of the barbican and the towers that flanked one of the gates of the fence. From the 17th century it retains part of the rampart fortification.

Of the castle built by King Dinis between the 13th and 14th centuries, only a few small stone walls that surrounded the old town remain. The area where the wall existed is currently occupied by housing.

This is a granite pillory with hexagonal format and four steps. Presently it has one only stone. It is said that during poverty times the population slowly destroyed the castle and this pillory in order to rebuild their houses.