Castle in the Clouds (or Lucknow) is a 16-room mansion and 5,500-acre (2,200 ha) mountaintop estate in Moultonborough, New Hampshire, open seasonally to the public, and owned and operated by the Castle Preservation Society, a private 501(c)3 non-profit corporation. It overlooks Lake Winnipesaukee and the Ossipee Mountains from a rocky outcropping of Lee Mountain formerly known as "The Crow's Nest".