George Mason High School (GMHS) is a comprehensive public high school serving the independent City of Falls Church. Until January 2014, it was located in Idylwood, an unincorporated area of Falls Church, in Fairfax County, Virginia, adjacent to Falls Church City. As part of Fairfax Water's agreement to purchase the Falls Church Water System, the parcel with GMHS was transferred to Falls Church City. - Source: Wikipedia