Well not exactly shrines but a marking of the landscape with stones made by Richard Long, who lived, or maybe still lives on the Isle of Lewis.
http://www.richardlong.org/Sculptures/sculptures11.html
I came upon him through the new book of Robert Macfarlane, - The Old Ways, journeying on foot through landscapes and the marking of these journeys by leaving stones in a pattern.
The making of cairns, or the single stones through the stony rugged landscape of Scottish islands can also mark the pathways to the shielings and peat cutting areas.
If you go to the index page he writes....
In the nature of things:
Art about mobility, lightness and freedom.
Simple creative acts of walking and marking
about place, locality, time, distance and measurement.
Works using raw materials and my human scale
in the reality of landscapes.