This is the 263-acre home of the Liberty Travel co-founder and his wife. The 20,000+ sq ft estate, known as "Hillandale", has been on the market for a whopping $95M. Although the city and state below are Connecticut, half of the estate actually lies in Pound Ridge (NY). The high price of the luxury property is partially due to it's large amount of land so close to New York City.
The estate is currently on the market for $75M.