Biltmore Estate is a large (6950.4 acre or 10.86 square miles) private estate and tourist attraction in Asheville, North Carolina. Biltmore House, the main residence, is a Châteauesque-style mansion built by George Washington Vanderbilt II between 1889 and 1895 and is the largest privately owned house in the United States, at 178,926 square feet (16,622.8 m2)[2] of floor space (135,280 square feet (12,568 m2) of living area). Still owned by George Vanderbilt's descendants, it remains one of the most prominent examples of the Gilded Age. Vanderbilt commissioned prominent New York architect Richard Morris Hunt, who had previously designed houses for various Vanderbilt family members, to design the house in the Châteauesque style, using French Renaissance chateaus that Vanderbilt and Hunt had visited in early 1889, including Château de Blois, Chenonceau and Chambord in France and (WADDESDON MANOR)in England, as inspiration with their steeply pitched roofs, turrets and sculptural ornamentation. Waddesdon Manor was a principal source for the east elevation of Biltmore Estate.
From Wikipedia
https://www.youtube.com/watch?v=x_1bQ1L5O6Y
(Quick two minute tour of Biltmore Estate including indoor pool)
________________________________________________________ 
Waddesdon Manor is a country house in the village of Waddesdon, in Buckinghamshire, England. It is located in the Aylesbury Vale, 6.6 miles (10.6 km) west of Aylesbury. The Grade I listed house was built in the Neo-Renaissance style of a French château between 1874 and 1889 for Baron Ferdinand de Rothschild (1839–1898) as a weekend residence for grand entertaining and as a setting for his collection. The last member of the Rothschild family to own Waddesdon was James de Rothschild (1878–1957). He bequeathed the house and its contents to the National Trust. It is now managed by the Rothschild Foundation chaired by Jacob Rothschild, 4th Baron Rothschild.
2017 mid-air collision
On 17 November 2017, a mid-air collision occurred between an aeroplane and a helicopter near Waddesdon Manor,resulting in four deaths, two on each aircraft. The crash happened just outside the Manor grounds, close to the village of Upper Winchendon. The wreckage landed in dense woodland. Emergency services were called at 12:06 GMT. Seven fire vehicles, the Thames Valley air ambulance, two ambulances, and a rapid response vehicle attended.
The crash involved a Cessna 152, registration G-WACG, and a Guimbal Cabri G2 registration G-JAMM, each with two people on board.[ Both aircraft had come from Wycombe Air Park, 23 miles (37 km) from the crash site. The Cessna had previously been involved in an incident in 1993.
The pilot of the helicopter was Mike Green, an instructor who was training a student pilot at the time. The student pilot was later announced as being a captain in the Vietnamese Army, who was training to become a military flight instructor.The bodies of all four victims were removed from the site on 19 November.
Thames Valley Police stated that the Air Accidents Investigation Branch (AAIB) had been informed. Military support was provided to assist with recovery of the wreckage of the two aircraft, which was dispatched to the AAIB's headquarters at Farnborough Airport, Hampshire.
From Wikipedia