Paul Allen's personal airplane collection, possibly the richest airplane collector there is

It's said to have 50 aircraft, possibly open to the public, at Everett Washington, near Seattle.

The planes are both retired and found, from forests and jungles.

http://www.warhistoryonline.com/war-articles/inside-microsoft-mogul-paul-allens-multi-million-dollar-wwii-airplane-collection-2.html