Coordinates: 43°43′42″N 71°19′19″W / 43.72833°N 71.32194°W
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".
The home was built in 1913-1914 in the Craftsman Style by millionaire shoe manufacturer Thomas Gustave Plant (1859-1941) for his second wife, Olive Cornelia Dewey. Its nickname Lucknow may have been a play on words on the city of Lucknow in India. The property was assembled from the private Ossipee Mountain Park, an observation area called the Crow's Nest, and a variety of other lodges and buildings. He razed the structures and built the mansion, a stable/garage, gatehouses, a greenhouse, farm buildings, and a golf course. The property eventually extended to 6,300 acres (25 km2).
Designed by prominent Boston architect J. Williams Beal (assisted by his sons John Woodbridge Beal and Horatio Beal), the house included many innovations which were rare at the time, including a circular shower, interlocking kitchen tiles, and a central vacuum system. The interiors were designed by Irving & Casson-A.H. Davenport. Bronze and tile work were by William Jackson & Company; electric fixtures by Edward F. Caldwell & Co.; and glass by Tiffany.