sentences:  Dover Hill, which is the highest point in Folkestone, was a sighting point for the Anglo-French Survey (1784–1790), which measured the precise distance between the Royal Greenwich Observatory and the Paris Observatory.The hill provided a sight-line to the east along the line of the Folkestone Turnpike to Dover Castle, one of the two principal cross-channel observation points, the other being Fairlight Down in Sussex.Until the 19th century Folkestone remained a small fishing community with a seafront that was continually battered by storms and encroaching shingle that made it hard to land boats.