When I read Idylls of the King, I hear homeric bards reciting the lines with pacing that would make you proud to be human. I picture listeners gathering night after night to hear the Great Stories. Camelot is “the city built to music, and therefore never built at all, and therefore built for ever.”
It’s a past that never was (and certainly not when Tennyson wrote it), but it’s lovely just the same. I particularly liked the story of Gareth and Lynette.
Taste it via Gutenberg. I recommend the Gareth/Lynette and Merlin/Vivien chapters, since the Arthur chapters can actually be a bit confusing for new readers.