The richness of the Weald's natural resources led it to become an industrial centre of Britain, as both the iron and glass industries needed large amounts of timber for fuel. There is a site of a bloomery iron works at Coneyhurst Gill and glassmaking sites at Ellen's Green and Summersbury/Somersbury. The wealth of the area can also be seen in the many fine timber framed houses dating from this medieval and Tudor period, however reliance on coal and the work of the industrial revolution later led to neglect, poverty, highwaymen and smuggling exacerbated by the less well trodden transportation connections.