David,
I believe the cropped versions (the first two) are stronger than the third, which tells us too much. But, I feel the first two would be improved with more foreground - about the same amount as in the third. They fell too cut off without that foreground.
Another compositional option would be one with more sky as negative space, so that the building, now open to the sky, has breathing room above.
If you have any if these compositions as additional frames, consider exploring them as well.
I do like how the ruined top edges of the walls reflect the top "edges" of the background mountains, but in an opposite direction. There just might be a tightly-cropped image highlighting that concept, as well.