ColSilver, isn't finding a space like the one you've just described wonderful? I've got a few of those myself -- sometimes small, those little holy spaces seem to connect you with others who have experienced the same things on that spot.
"It keeps eternal whisperings around desolate shores..." I love this phrase, too. The word "desolate," in this case doesn't have its lonely, abandoned sort of connotation. It's soothing and to me speaks of solitude and permanence, not loneliness.
Another thing (Please, no one roll your eyes!

) that keeps me coming back to Keats is the "feel" of the words in my mouth when I read or recite a poem aloud. Keats had a theory about open and closed vowels that I've never been able to quite understand, he also used alliteration frequently. These things just add the poetry and the effect isn't artificial or contrived. It's as if the particular poem had always existed and that Keats merely gave it form. (Does that make sense? I often have a hard time articulating thoughts.)
Yes, I agree wholeheartedly. When I am looking at the sea in my little bay on Jersey, I am looking at something that, because of its peculiar beauty, was loved by generations of people before I was born, and will be loved by generations of people after I am gone. It is about the continuity of experience, I think, feeling a part of something bigger than oneself.
It's interesting that you use the word "holy" in this context, and that we have both used the word "spiritual" in describing Keats' poetry. I'm reminded of a favourite phrase of mine from the great Victorian art critic John Ruskin: "The greatest thing a human soul ever does in this world is to
see something, and
tell what it saw in a plain way. Hundreds of people can talk for one who can think, but thousands can think for one who can see. To see clearly is poetry, prophecy and religion, all in one". Keats saw things
clearly, and through his genius as a poet, he "told what he saw in a plain way", which may sound counter-intuitive unless one understands it as meaning that Keats' poetry is so beautifully expressive and colourful that our own imaginations are stimulated into allowing us to see what he saw. When I recite
On the Sea to myself, I am momentarily, fleetingly, seeing the sea as Keats saw it.
Keats, of course, loved solitude (to write and study) and wrote about it in his poem, O Solitude (which he wrote after reading Wordsworth's "Prefatory Sonnet"). I agree that his theory of open and closed vowels can be rather technical, but I think we can understand it in terms of the "musicality" of his poetry (which Bailey remembered decades after Keats had discussed it with him in Oxford). Keats used an amalgamation of alliteration and assonance to create a synaesthetic experience, a blend of pleasing sound and colourful description which, in my opinion, has never been surpassed. I think I understand what you mean when you say:
It's as if the particular poem had always existed and that Keats merely gave it form.
Plato believed in another world or dimension where everything is perfect, with everything here on Earth (a rose, beauty, justice) being an inferior manifestation or shadow of its perfect, eternal counterpart in the Platonic realm (St Augustine used the theory to develop his conception of God). It is often said that Keats'
To Autumn is the most perfect poem in the English language. In Platonic terms it always existed, and Keats gave it form.