 Areas of Tulsa west of the Arkansas River are called West Tulsa, and are marked by large parks, wilderness reserves, and large oil refineries.The northern tier of the city is home to OSU-Tulsa, Gilcrease Museum, Tulsa International Airport, the Tulsa Zoo, the Tulsa Air and Space Museum, and the nation's third-largest municipal park, Mohawk Park.Tulsa includes many structures built during the Oil Boom in the 1920s and 1930s, including Art Deco buildings such as Boston Avenue Methodist Church and Tulsa Union Depot.