Coordinates: 51°20′05″N 7°28′38″E / 51.33472°N 7.47722°E
The Hagen Westphalian Open-Air Museum (German: LWL-Freilichtmuseum Hagen – Westfälisches Landesmuseum für Handwerk und Technik; English: "LWL Open-air Museum Hagen – Westphalian State Museum for Craft and Technics") is a museum at Hagen in the southeastern Ruhr area, North Rhine-Westphalia, Germany.
The museum was founded, together with the Detmold Open-air Museum, in 1960, and was first opened to the public in the early 1970s. The museum is run by the Landschaftsverband Westfalen-Lippe (LWL, regional authority for Westphalia and Lippe within North Rhine-Westphalia). It lies in the Hagen neighbourhood of Selbecke south of Eilpe in the Mäckingerbach valley.
The open-air museum brings a bit of skilled-trade history into the present, and it takes a hands-on approach. On its grounds stretching for about 42 ha, not only are urban and rural trades simply "displayed" along with their workshops and tools, but in more than twenty of the nearly sixty rebuilt workshops, they are still practised, and interested visitors can, sometimes by themselves, take part in the production.
As early as the 1920s, there were efforts by a group of engineers and historical preservationists to preserve technological monuments for posterity. The initiator, Wilhelm Claas, even suggested the Mäckingerbach valley as a good place for a museum to that end. The narrow valley was chosen, as wind, water and wood were the three most important location factors for industry in the 18th and 19th centuries.