As far as aesthetics, I’m a sucker for halls. (Yes, I realize the above is from a former church, but roll with me).
Forget what I just said about this being a church. Consider just the image of the structure – the stone, the path in the middle. Sky above – but what if it’s not?
What if this is an underground passage – either fully underground, or at an end? Of what – a secluded/lost settlement? A Necropolis? What’s between the columns? Altars for the dead? Residences?
Use the image as a skeleton – is it truly in that state? What if it were “new” – what would it look like? What sort of people would use such a space – what would it be used for? Continue as a church? A road through a narrow valley?
When/where is this being discovered – something a “native” resident is finding, but what if it’s someone displaced (think – time travel, or new discovery from a space traveler)?