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Bailey Arboretum Home to the Worlds Largest Dawn Redwood Learn More Volunteer Welcome to Bailey Arboretum where people connect with nature. Bailey Arboretum is a beautiful 42 acre accredited arboretum located on the North Shore of Long Island in Locust Valley New York. Situated on the estate of renowned horticulturist and philanthropist Frank Bailey Bailey Arboretum offers community and educational programs throughout the year. Bring the family and enjoy our well marked trails peaceful gardens and the freedom to stroll the beautiful grounds.