This is so clever and interesting. Congratulations!

But... I want to see a photo! Or at least what it looks like in Google Earth, with a red arrow marking the furthest point.

It feels like the site is setting you up for the big suspense of the longest line of sight... and then it's just a line on a 2D map.

I think it would also really help if the maps themselves were at an angle in 3D with an exaggerated relief, with the line drawn in 3D, so you can get a sense of how it travels between two peaks.

It seems like you've put a ton of effort into this project. I think with just a tiny bit more work on the page, you could really put the "cherry on top".

And with those visualizations, get it picked up by a lot of major news outlets. This is a really fun story, the kind of stuff newspapers and magazines love to run. It's easily understandable, it's a cool new "record", it's a story of someone's perseverance paying off, and then you show a Google Earth image simulating the view as the payoff. (And from slightly above, if necessary, to take account for refraction.)

EDIT: Here, I used Google Earth to show the two points. Unfortunately it's from high above, since otherwise Earth wouldn't show the pin for Pik Dankova, but it at least gives a general idea of the area:

https://imgur.com/hindu-kush-to-pik-dankova-530km-adbVFwb

And here is the Google Earth link for the view, but it doesn't contain the pins:

https://earth.google.com/web/search/41.0181,77.6708/@36.6644...