The first written evidence of Zwischenahn dates back to 1124 in connection with the founding of St. John's Church by Count Egilmar of Oldenburg.

[6] Since 1943, the airport was home of the Erprobungskommando 16 service-test unit, then Jagdgeschwader 400 each in their turn operating the Messerschmitt Me 163 Komet rocket fighter from the base.

[7] The main economic activities of Bad Zwischenahn were and are based on tree nurseries, the food industry (sausage and ham production), and resort community services for the well to do urban population of Oldenburg and Bremen.

It is part of a historical museum farm consisting of 14 houses and auxiliary buildings that were moved to their today's location from 1909 to 2004.

The institution, already founded in 1857 as a lunatic asylum, nowadays having a good reputation, was notorious during Adolf Hitlers Third Reich.

A small building on the institution's premises, Alte Pathologie, (Ancient Pathologic Lab), was transformed into a memorial centre in 2002.

In 2017, a movie, starring Nadja Uhl, titled Ich werde nicht schweigen ( I will not keep silent), was brought out.