Fort de la Conchée is an island fortification constructed by Sebastien Vauban. In 1689 Vauban conducted an inspections of French coastal fortifications for King Louis XIV, who wished to strengthen and improve the country's defences. In 1693 whilst the fort was being constructed the English raided the town. They landed on Conchée where they slighted the works and captured those working on the fort.
Again in 1695 the English, with their Dutch allies, attacked the fortress. Though the fort was unfinished, ten guns had been installed, which permitted the French to repulse the attack. The battery then turned its guns on the main attacking fleet causing much damage to it. The fort was finally finished in 1705. The fortress was demilitarised in 1901.
During the Second World war the Germans used the abandoned fort for target practice. The Allies then attacked the fort during St Malo's liberation.
The fort covers almost the entire island. The fortress consists of a granite two-storey structure, with an upper terrace for the fort's armament.
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.