Bailey Arboretum is a 42-acre (17 ha) arboretum located in Lattingtown, New York, a small village on the North Shore of Long Island. It opened to the public on Aug. 5, 1969 after being donated to Nassau County in 1968 by the heirs of Mr. and Mrs. Frank Bailey. Through an agreement with the Village of Lattingtown, admission to the arboretum was limited to 200 people at any one time.