In Israel there is something called Israel National Trail (Hebrew: שביל ישראל, Shvil Yisra'el). It is a trail that goes from the north of the country to the south in about 1000 km. A trail where you will go through all types of natures and a great way to visit and learn about Israel. The trail is marked with three stripes (white, blue, and orange), and takes an average of 45-60 days to complete.
In addition, there are places to stay for a small amount of money somewhere in the middle of the trail. Even some few places for free. This is the case when you don't use tent.
I would want to know if there are similar things in different countries, where there is a built trail, that travelers take. Obviously, if you can give examples where there it's secure.