located next to the New York State Capitol in Albany, New York. Nelson Rockefeller transformed previously empty basement passages beneath the mansion that had led to a grotto into a major private art gallery containing paintings by Picasso, Chagall, and Warhol, the latter two having visited the estate. Between 1935 and the late 1970s more than 120 works of abstract, avant-garde, and modern sculpture from Nelson's collection were added to the gardens and grounds, including works by Pablo Picasso (Bathers), Constantin Brâncuși, Karel Appel (Mouse on Table), Jean Arp, Alexander Calder, Alberto Giacometti, Georg Kolbe (Ruf der Erde), Gaston Lachaise, Aristide Maillol, Henry Moore, Louise Nevelson, Isamu Noguchi (Black Sun), and David Smith. Public tours The inner park area was opened to restricted conducted tours of the mansion and immediate surrounds in 1994, but remains occupied and controlled by the family by the Rockefeller Brothers Fund, which leased the area from the National Trust for Historic Preservation in 1991 and serves as steward of what is referred to as "the historic area". Public tours are conducted by Historic Hudson Valley, an organization established in 1951 by John D. Rockefeller Jr. "to celebrate the region's history, architecture, landscape, and material culture, advancing its importance and thereby assuring its preservation." Shuttle vans run from a visitor center located at the Philipsburg Manor House on Route 9 in Sleepy Hollow, New York. Pocantico, the family estate The estate, known as Pocantico or Pocantico Hills, occupies an area of . During much of the 20th century, the estate featured a resident workforce of security guards, gardeners, and laborers, and had its own farming, cattle, and food supplies. It has a nine-hole, reversible golf course, and at one time had 75 houses and 70 private roads, most designed by John D. Rockefeller Sr. and his son. A longstanding witticism about the estate quips: "It's what God would have built, if only He had the money". In 1901, John D. Rockefeller Sr. hired golf course architect Willie Dunn, the designer of Shinnecock Hills Golf Club, to build a golf course on the grounds. In late 1946, two of Junior's sons, John D. Rockefeller III and Laurance Rockefeller, each offered their respective residences, Rockwood Hall and Fieldwood Farm, as headquarters for the then newly formed United Nations. Family patriarch Rockefeller Junior vetoed the proposals, as the sites were too isolated from Manhattan. He instead tasked his second