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. The tour includes part of the main Mellon residence and all of its extensive garden, the formal greenhouse, the Little Oak Spring Gallery, and the Broodmare Barn, where Paul Mellong 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 the New York architect H. Page Cross. The walled garden, designed by Bunny Mellon, incorporates individually designed formal and informal 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.