Chiltern Open Air Museum, founded in 1976, preserves the built heritage of the Chilterns through 30+ historic buildings rescued from demolition and reconstructed on a 45-acre site. This living history museum features structures from the 1400s to the 1940s, including farmhouses, barns, a Victorian toll house, and a 1940s prefab. The working historic farm with traditional breeds and the authentic period buildings create immersive historical experiences. The museum's commitment to preservation and education through hands-on experiences, from brick-making to traditional farming, makes it a unique window into 500 years of Chilterns rural life. **Filming Scenes:** The museum's working farm provided the setting for Lady Edith's tractor-driving scenes in Series 2, when she joined the war effort by helping with agricultural work. The authentic farm buildings and equipment meant the production could film period-accurate farming scenes showing how the war transformed traditional estate life. Various barns and outbuildings appeared as tenant farm locations throughout the series. The museum's collection of period-appropriate agricultural machinery and authentic rural buildings eliminated the need for constructed sets, providing genuine historical context for storylines about the estate's agricultural economy.