Adult uses shall not be located within a five-hundred-foot radius of any school, nursery school, day-care center, educational institution, house of worship, park or playground, historic or scenic resource and civic or cultural facility. For measurement purposes, the distance between an adult use and other such named uses shall be measured in a straight line, without regard to intervening structures or objects, from the closest structural wall of such adult use to the closest property boundary of such school, nursery school, day-care center, educational institution, house of worship, park or playground, historic or scenic resource and civic or cultural facility.