I was at the Mississippi Sky Parade in Greenwood in October this year. They have a graveyard right there at the airport. They have at least 7 - 747-100s (at least 5 ex-United and one ex-Northwest), some old A300s (many ex- Garuda Indonesia), a couple DC-10's, and perhaps others. They weren't giving tours during the show, which was a bummer, but they did have a Polar Air Cargo N857FT 747-100 on display where you could get right up close to it. There's a little side road at the airport that you can use to see the aircraft a little better; take binoculars. If you search this forum on 'Greenwood', someone maintains a website on the graveyard, and has a lot of great photos of the aircraft. Perhaps someone knows how to get an actual tour.