We were somewhere on that vast, empty road when it happened. Our minibus slowed, and then stopped, because the road ahead was no longer empty. A herd of guanacos had surrounded us, curious and entirely unbothered, pressing close enough that we could see the details of their faces through the glass. Some were very young. All of them seemed perfectly at ease, which is more than could be said for some of us, in the best possible sense.
It is one of those moments that no itinerary can plan for. You are simply there, and then this happens, and the group falls quiet in that way that means everyone is making a memory they know they will keep. Nobody reached for a phone immediately. We just watched.
I have led walking holidays in a good many places, but I have rarely felt so clearly that I was a guest in someone else's landscape. The guanacos moved on in their own time. We did the same.