You might enjoy a book called “Motel of the Mysteries”. It hypothesizes a distant future where archeologists uncover a 20th Century motel room they mistake for a burial chamber. They come up with all sorts of religious ceremonial ideas to explain the mysterious items they find like a shower cap or toilet brush.
I think I have a copy of that.
Back in the 70s and 80s, whenever I saw a big shopping mall, it struck me that we were building structures on a scale that the ancients reserved for buildings devoted to religion. I thought when they dug us up, far in the future, they would wonder...
But we seem to be destroying all of those malls ourselves, now.
Maybe some of our cathedrals will last long enough to be dug-up.
There is a corner off my deck where I dispose of dead bouquets, which I have often. I know they will compost there and it is a spot we never walk to. (We live in the woods.) We have taken to calling it the "Altar" because in a thousand years someone will research all the DNA from all the flowers and assume they were thrown there as an offering.