Many of the county's major settlements are in the central, northern and southern areas, such as Watford, Hemel Hempstead, Kings Langley, Rickmansworth, St. Albans, Harpenden, Radlett, Borehamwood, Potters Bar, Stevenage, Hatfield, Welwyn and Welwyn Garden City, Hitchin, Letchworth and Baldock. These are all small to medium-sized locations, featuring a mix of post-WWII new towns and older/more historical locales. The City of St. Albans is an example of a historical settlement, as its cathedral and abbey date to the Norman period, and there are ruins from the Roman settlement of Verulamium nearby the current city centre. Stevenage is a mix of post-WWII new town planning amidst its prior incarnation as a smaller town. The Old Town in Stevenage represents this historic core and has many shops and buildings reflecting its pre-WWII heritage. Hitchin also has a historic centre, with many Tudor and Stuart era buildings interspersed amongst more contemporary structures.