We are are doing an in depth study of the book of Genesis and we were talking about all the different dimensions. My SS teacher is science oriented, so I had to ask him to teach this in laymens terms. Anyway, it is possible that the Garden of Eden is in a dimension that we, in the third dimension, cannot see. In other words, the Garden is still where God originally put it, but we were cast out of the dimension that it occupies and that is why nobody has been able to find it and try to get back in. We can pass through it, but because we are in a different dimension we cannot feel it or see it.

I think the whole thing is really fascinating.