[LorenPechtel]

There are parts of the world on such a trek that these days I would not want to cross by vehicle, let alone on foot.

In the 70s, though, I was with my parents on the Delhi-Tehran portion of the old Kathmandu-London route. I'm only seeing recollections of the old trips, though, no indication that groups are doing it now.

[Agingcoder]

Yes. Even 15-20 years ago, parts of Iran / Pakistan ( Baluchistan) were very tricky, and while on the road I met people who got kidnapped and eventually ransomed. Afghanistan was of course not a recommended path either.

I think in the 70s people went through Afghanistan, the Khyber pass and then Pakistan/Peshawar, which is a very bad idea these days.

Maybe I’ll see Khyber pass one day, I don’t know. The Hunza valley in northern Pakistan was incredible enough. Stay safe first !

Edit : this assumes you’re an obvious tourist. If you’re a local I guess things are very different