Open air museum Ammerländer Bauernhaus, Agricultural museum in Bad Zwischenahn, Germany.

The Ammerländer Bauernhaus is an open air museum in Bad Zwischenahn that displays traditional farmhouses, barns, and outbuildings from the North German region. The buildings are arranged on the grounds to show local architecture and farming methods from earlier times.

The open-air museum was founded by members of the Verschönerungs-Verein in und bei Zwischenahn, now the Verein für Heimatpflege Bad Zwischenahn, who from 1909 built a farmstead as it would have looked around 1700. The central Ammerländer Bauernhaus was assembled in 1910 from parts of two purchased farmhouses. The museum has been expanded continuously since, with the windmill added in 1960 and the 17th building erected in 2013.

The museum displays tools and household items from earlier generations, which guides explain during regular demonstrations. Visitors learn how people in the region lived and worked in the past.

The museum is open from March to November, with guided tours in Low German available for individual visitors and groups by arrangement. It is best to allow time to explore, as the buildings are spread across the entire site.

The windmill is a gallery Dutch mill (Galerieholländer) built in Westerstede in 1811. After several changes of owner it was shut down in 1958, and the heritage association bought it to save it from decay, rebuilding it on the museum grounds in 1960.