The Castle is more than just a castle: with its string of courtyards, a puzzle of palaces and churches, and maze of little streets, it is a real city within the city. Despite its long and often troubled history, it has been a unifying force for the whole nation, going beyond the divisions within, through times of starvation and decline. Within its walls, some of the country's greatest treasures are to be found: St Vitus Cathedral, St Georges Convent and the Castle Picture Gallery.