Camp Concordia housed 4000 German POW's and 815 American guards. Building T-64 was built in the spring of 1943 at the entrance of the camp as guard post 20, located in the center of MacArthur Avenue, and everyone entering or leaving the camp had to be cleared by the guard there. For those driving by, it represented Camp Concordia. When the camp was dismantled in 1945-46, the building was purchased and moved to Scandia, where it was used as an office at a feed lot after lap siding, asphalt shingles, pine paneling, different lighting, electrical outlets, and phone lines were added. It remained in use there until 1998, when Annette Bredthauer, DVM, donated it to the POW Camp Concordia Preservation Society. Volunteers then moved it from Scandia to its present location, restored the south end as it was in 1945, preserved evidence of the building's different stages inside, and painted the exterior as it was in 1945. Today it serves as a mini-museum of Camp Concordia, maintained with its grounds by the POW Camp Concordia Preservation Society.