The Castle of Monção was built by King Denis of Portugal in 1306 and it was enlarged in 1656. From the original castle, the only remains are two doors, some pieces of the medieval wall, and the Torre de Lapela Towers, which shows off the coast of arms of King Ferdinand I.
From the walls, the only remain is the main door, defended by the Keep, with a Gothic style; and the treachery door, with a smaller size. From the 17th century fortress there are many parts still standing, such as the Porta de Salvaterra Door and some bastions.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.