Or resonate a frequency throughout the building thus healing or some other spiritual ritual

This is the north face of the cathedral which would never see the sunshine but still has a large window to let in light..

The moon shines on the northern side tho

South Window

East where the sun rises

West where the sun sets

Mud flood

There is definitely water involved in whatever was happening and and don't want people to know that because this is clearly half buried because its a water gate but the official narrative is that its a castle Fort wall and this was just a gate

That's clearly a water gate

River no longer there but there's a straight road.
Cathedral is built on top of a hill so this river ran either next to the Cathedral or underground

So we know water, sound and light is involved in whatever they were doing.

No water within a mile and that water is at the bottom of the hill so the only way there possibly can be water at the top of the hill as that illustration suggests is from the road that I have said