Hi FlagshipAZ, Buzz here. If you come to Portland Oregon, it's about an hour's drive SW
to McMinnville airport (MMV) which is across the street from the Evergreen Museum. You can see the "barn" from several miles away when you fly in the area.
Engines and a few other parts are quite out of reach, but the Hughes HK
-1 is assembled and they have a nice musueum there.
For more large engine stuff, try a web site www.enginehistory.org and see what the Aircraft Engine Historical Society has posted, it's interesting stuff.