It was already there but buried under years of neglect and overgrowth- felt like an archaeologist digging it out and discovering it lead all the way up the garden. Its anything but level though ;)
Ha, that was exactly my experience here. Had no idea there was one at all running the whole length. Clearing the garden became measure in how many flags I uncovered in a given session. Although mine is ugly council flag stones, but beefy because of it.
I like how you've done your path.