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Does this mean that there is no known place (point) on Earth from which you can see some other point that is more than 538km away?

Under certain atmospheric conditions it may be possible to see further

I wonder what the maximum you can ever see is due to atmosphereic fog. I suspect it's less than 538km.

The site has photos listed for up to 381km, although the link for that one is broken.

Fog is definitely a factor.

This is why some microwave radio antennas point up. They bounce the signal off the troposphere to pair with a receiver farther away than the horizon. https://en.m.wikipedia.org/wiki/Tropospheric_scatter