Virginia Living magazine has produced a wonderful article highlighting the incredible Mellon legacy. The Mellons - Paul and Bunny - made Upperville the center of their prestigous universe for many years. You can read the article here. The estate was for sale a few years back for a staggering $70M.
You can read more about Paul Mellon here in this 1978 article from People. The Mellons loved great art, the country, books and horses, but maybe not in that order.
As is often the case for people born into great wealth, they had an obligation to give back to the world that had blessed them both, and gave they did to numerous causes, schools, museums, and localities inside and outside their adopted state of Virginia. Bunny loved books and her collection of almost 20,000 books is impressive by anyone's standards.
The farm was broken up into parcels according to this article (there are more great photos) which is so sad but not many people have $70M to purchase a farm, not to mention, the maintenance. Hopefully the Mellon legacy will live on through the museums, the artwork, the books and the gardens they left behind. (Most photos are from Virginia Living).