I wish that I had hiked the Appalachians mountains. its a 7 month journey one of my friends did it in his 20's. I'm in my 40's and in good shape, but im not sure I could do that one anymore.
I'm also perusing of doing a pilgrimage, not because I'm religious, but because it has a lot of facilities along the way. The real thing stopping me is to take the time off to do it.