Do you plan to walk in Europe?
Have a look here!
Country specific information about walking can be found via this page.
It may be difficult to find routes and tracks, but this page gives advice about electronic possibilities.
Above all, do not loose your desire to walk. Every day I walk myself into a state of well-being and walk away from every illness. I have walked myself into my best thoughts, and I know of no thought so burdensome that one cannot walk away from it.
— Søren Kierkegaard