Old Westbury Gardens, listed on the National Register of Historic Places, is the former home of John S. Phipps; his wife, Margarita Grace Phipps; and their four children. Completed in 1906 by the English designer George A. Crawley, the magnificent Charles II-style mansion is nestled amid 200 acres of formal gardens, landscaped grounds, woodlands, ponds, and lakes. Westbury House is furnished with fine English antiques and decorative arts from the more than 50 years of the family's residence.

Old Westbury Gardens welcomes visitors of all ages for guided tours of Westbury House and Gardens, in-depth tours of the formal gardens, school visits, children's programs and events, family programs, museum exhibits, classic car shows, indoor and outdoor classical concerts, summer concerts, slide lectures, book signings, horticultural demonstrations and workshops, Scottish Games, botanical arts and gardening classes, and educator-led talks and tours of topics relating to horticulture, art, history, design, and architecture.

Old Westbury Gardens seeks to inspire appreciation and knowledge of the best qualities exemplified in the American country estate of the early 20th century through faithful preservation of its landscape and gardens, architecture and collections.