This place is amazing:
Storm King Art Center is a museum that celebrates the relationship between sculpture and nature. Five hundred acres of landscaped lawns, fields and woodlands provide the site for postwar sculptures by internationally renowned artists. At Storm King, the exhibition space is defined by sky and land. Unencumbered by walls, the subtly created flow of space is punctuated by modern sculpture. The grounds are surrounded by the undulating profiles of the Hudson Highlands, a dramatic panorama integral to the viewing experience. The sculptures are affected by changes in light and weather, so no two visits are the same.
I have wanted to go for a while now but it is a bit of a drive from the city. It was so hot! Spring and Fall may be a better time to visit.
Here are some pics:
[Pyramidian by Mark di Suvero]
[Gui and Knobs by Alexander Calder]
[Black Flag by Calder]
[The Arch by Calder]
[City on the High Mountain by Louise Nevelson]