Farm Heritage Trail. The Johnston County Heritage Center is known as one of the best equipped facilities in the country for studying local history and genealogy. A variety of public records, private manuscripts, photographs, family histories, old newspapers, and artifacts are assembled in commodious quarters to allow scholars, amateur historians, and genealogists alike to study the history and culture of Johnston County and its people. Located off I-95, Exit 95, on US Hwy 70 Business.