This is a big job! At the moment just listing reports – resources might come at a later stage.
For some countries, e.g. USA and Western Europe, there are numerous accounts easily accessible so I’m not listing them at this stage. So if you decide to pull a Forrest Gump, it’s not hard to find reports on your own.
I have done my best to find the original material by the author. Further exploring will uncover more material. Other links go to press articles.
If you know of a walk across a country, or have done one, let me know so it can be shared!