With magnificent views of the Blue Ridge and Bull Run Mountains, Little Oak Spring is part of the once much larger Rokeby Farm, the home of Paul Mellon and Rachel “Bunny” Lambert Mellon, two of the greatest American art collectors and philanthropists of the late 20th century. It is owned and operated by the Oak Spring Foundation. The tour includes part of the main Mellon residence, all of its extensive garden, the formal greenhouse, the Oak Spring Gallery, and the Broodmare Barn, where Paul Mellon raised his most successful thoroughbreds, including Sea Hero, winner of the 1993 Kentucky Derby. The main residence is a complex of whitewashed stone buildings designed by New York architect H. Page Cross. The walled garden, designed by Bunny Mellon, incorporates formally and informally designed spaces, separated by brick and gravel paths and set on three terraces. Distinctive features include espaliered fruit trees, reflecting pools, and a bridge to a garden pavilion. Beyond the north wall, a crabapple arbor leads to the formal greenhouse, with its magnificent trompe l’oeil decoration.