Historical Fun at the McClain! The McClain County Historical Society & Museum in Purcell functions to research, preserve and perpetuate the history of McClain County Oklahoma and its people. The museum houses a collection of photos, letters, mementos and artifacts from generations past. Located in the Historical Old McCurdy Hospital building, the McClain County Museum holds a special spot in the hearts of local residents and former residents. Visitors to the museum have the opportunity to see Oklahoma's history up-close and personal. Stop by and spend a delightful afternoon exploring the roots of this county and the State of Oklahoma!