OK, so I just left north brittleshin pass, and have come across some standing stones(?) With 3 pillars you can rotate to unlock (I assume) a nearby grate which has a chest in it. Anyone know what I have to rotate the pillars to to get it to unlock? Its up n to the left of north brittleshin pass on the map.

If its the same as i opened u have the symbols on the pieces laying next to each column,they have wittered and fallen down on atleast 2 of them.
Then just turn so the right symbol is facing the button in the middle,then activate it to open the grate.

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