Tags: Garden.
The Mary Flagler Cary Arboretum (1924 acres; 7.7 km²) is a nonprofit arboretum located on U.S. Route 44 near Millbrook New York. It is operated by the Cary Institute of Ecosystem Studies and open to the public without an admission fee.The arboretum was established by Mary Flagler Cary (1901–1967) a granddaughter of Henry Morrison Flagler and heir to part of the Standard Oil fortune and her husband Melbert Cary. After her husband’s death in 1941 Mrs.