The final act before walking away from ANY location, regardless of why you paused or what you were doing there, is to stop, turn around, and visually verify that nothing has been left behind. This especially goes for places you know you will never return to.
A lesson originally learned over 30 years ago while working in the field as a geologist. I very nearly single-handedly kept the rock hammer manufacturing industry afloat. Seems that when one uses a compass the best practice is to first remove the hammer from your belt, drop it on the ground, then walk a couple of steps away.
Adapted to camera equipment, this rule is by now deeply instinctive and has saved me a fair amount of agony (and money) over the years.
Ken