Soon enough it will become impossible to tell whether an image is a photo or generated by AI. I no longer exhaust the mental energy in trying to figure out the source of the image and just enjoy the pretty pixels.

Though in this case I suspect this is a photo taken with a fully open lens aperture, hence all the blur and distortion in the background. The decorative railings likely look distorted because of the distance between them and the type of lens used.

Edit: I found it on an archived /s/ thread on 4chan when reverse image searching, posted on 14 May 2023.