He tells Billboard.com, "It's indescribable. There's so much to comprehend. I knew all of the memorabilia was somewhere, but to see it all in one building is an awesome experience. I could spend a week in here and probably not see every single thing. It's something that people that come to Nashville from all over the world will want to see."
The items on display include the late country star's grade school report card and the ring given to him in the last year of his life.
Cash died in Nashville a decade ago (03), aged 71.