The Mission Historical Museum is dedicated to preserving the history of Mission for future generations. It offers short and long-term exhibits and holds a variety of events and programs each year. It is housed in two buildings: a former post office and the former company building of citrus grower John Shary, who became known as the Father of the Texas Citrus Industry. The area between the buildings was redeveloped in 2013 as a place for outdoor performances. Shary constructed the building in 1939. The city acquired the property in 1960 and used it as City Hall. The museum opened in 2000.
John Shary arrived in Mission in 1915 and saw an opportunity in citrus farming. His first crop was in 1922 and eventually he owned tens of thousands of acres of property.