https://beyondrange.wordpress.com/2016/08/03/pic-de-finestre...
That's a cool thing to track, I've been surprised by the places I've seen the Seattle skyline reflected on the water near sundown. No crazy distances, but there's a small time period where it flashes into view.
Quite a bit shorter in distance (between 200 and 300km depending on where you sit) but visually stunning.
I seem to recall in older times there used to be some light semaphore infrastructure to communicate over these distances.
https://web.archive.org/web/20251008080738mp_/https://i72.se...
https://www.vosgesmatin.fr/environnement/2023/12/19/quand-le...
https://www.vosgesmatin.fr/environnement/2022/11/12/quand-le...
† Which I hiked this year, unfortunately only had a phone so all I get is the memory of seeing the Mont Blanc from there.