Hunmanby. The main source of employment in the vale is agriculture with tourism and retailing in the market towns and near to the coast. Places of interest Ruins of Helmsley Castle begun after 1120 by Walter Espec, who also founded Rievaulx Abbey and Kirkham Priory. Nunnington Hall, 17th century manor House with a sheltered walled garden on the banks of the River Rye. Pickering Castle, a classic and well-preserved example of an early castle. Filey Flamingoland Malton, the largest of the market towns in the vale, with Roman beginnings and good exhibitions of local archaeology in the museum. References Valleys of North Yorkshire Natural regions of England