In the middle of the eighteenth century Ralph Allen, who had both a Bath townhouse and the Prior Park estate in a fine landscape just out of town, erected a gothic eye-catcher on high ground above Bath. The folly took the form of a turreted and castellated screen, unadorned at the back and intended only to be viewed from the city. By the end of the eighteenth century the folly had become known as the ‘Sham Castle’, and it has attracted the gaze of artists ever since it was built.