There is an ornamental gold cross in the church at the end of Oblivion Ridge with a directional-pad shape in the center and two arrows on either side on the horizontal bars. Are you supposed to do something near it to activate it?
As far as I know, the only thing to do is to destroy the lower portion of the wall, as it conceals a hermit ring.
Here's a youtube video of someone breaking the wall:
Actually, a later quest with the old lady has you sketch the inside of the church, so the cross sseems to act as a marker for that.