The Kunlun Mountains form the northern boundary of Tibet. If you stand on summit of them and look northwest, you should be able to see Pik Dankova, the tallest mountain in the Tian Shan range of Kyrgyzstan 329 miles away--provided that the weather is clear.
This is the farthest line of sight on the planet Earth.
Google Maps Mania directs our attention to All the Views, a fascinating interactive tool that allows you to calculate the farthest line of sight from any location on Earth.
It's an interactive tool that is fun to explore. I learned that the farthest line of sight in Texas is Guadalupe Peak which has a line of sight of 140 miles to the southeast.
-via Nag on the Lake
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