There is a spring in there that adds to the surrealness, and the whole back wall is literally the mountain. Like, not a rock wall or slab, but the actual mountain.
But I think for me it’s the walk up there. You really feel like you exit the modern world and enter a sanctified space. It feels like an encapsulated pilgrimage. There’s something like 200+ steps and it’s in a tunnel largely. You hear nothing but people going up or down the steps.
I’ll admit it’s super modest, but the outside is very grand when viewed in scale. Like a castle from a fairytale over the small village. And while I love the big grandeur of the cathedrals, since they’re usually super mobbed and often in a busy part of a well populated town, there’s an encroachment that affects the experience. This church didn’t have that when I went, so it was less of a shoulder-to-shoulder mob tourist experience and more compartmentalized and personal. It was very easy to imagine looking up at it in the 1500s and just be awestruck.