Texas ranch sale created over 90% of Guadalupe Mountains National Park
In 1934, J.C. Hunter proposed a land donation to the government for national park purposes, though it did not proceed. Years later, in 1969, his son, J.C. Hunter Jr., facilitated the sale of a much larger land parcel to the government, constituting more than 90% of what would eventually become Guadalupe Mountains National Park.
We haven't written up this one. Times of India has the full story — the link below goes straight to it.