Although I wouldn't undertake this myself, I think this is very cool. My Aunt, MJ (MaryJane), is walking across Spain with her sister. (They were estranged for many many years and recently reconnected.)
The trip is just starting and she's blogging about it as they go. It will take them - I think she said - 6 or 7 weeks to finish.
Want to check it out and follow along?
http://walknwomen.blogspot.com/