The Guarda Cathedral, commissioned during the reign of King João I, was only completed 150 years later, creating the perfect symbiosis between Gothic and Manueline. The interior has a magnificent chancel in Ançã stone, made by the Coimbra workshop of João de Ruão, and is the greatest work of erudite sculpture of the later Renaissance period.

It is a curious and unique stone monument built around the year I A.D. This tower is 12 meters high and has three partial stories, whose function is still not clear. Some of the hypotheses are that it may have been a temple, a prison, a patretorium (a general's tent or central area of a Roman camp), a mansio (inn) or even a Roman villa.

In the historic center of Castelo Novo we can find the Castelo Novo Castle, the Town Hall, the Pelourinho and the Tourism Office.

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.

It is an authentic monumental space where it is important to highlight the old walls, the ruins of the Palace of Cristóvão de Moura, the five hundred year old pillory, the main church, the medieval cistern and the vestiges that confirm the existence of New Christians.

This castle would have previously been a Lusitanian fortification. However, it was the Romans who made it grow militarily. During the reign of King Dinis, fortification and enlargement work was carried out, and only the wall with the adarve, cubels, five medieval doors and two sturdy square towers have survived to the present day.

Shaped like a polygon, the area covered by the village is limited to the urban nucleus and the surrounding area of the ramparts, where there are bastions, fortifications, gates, casemates and moats. This huge military complex was built in the 17th and 18th centuries.