The Royal Gunpowder Mills, Waltham Abbey, an Anchor Point of the European Route of Industrial Heritage, (ERIH), set in 175 acres (0.71 km2) of parkland and containing 21 buildings of major historical importance, mixes history, science, and attractive surroundings. It was one of three Royal Gunpowder Mills in the United Kingdom of Great Britain and Ireland, the other mills were at Ballincollig and Faversham, but is the only site to have survived virtually intact.