This is the narrowest point of the pass

This is the narrowest point of the pass
Originally uploaded by bastchild.

It used to be so narrow that two fully-loaded camels could not cross side-to-side. This bottleneck was the only way to the Indian subcontinent from Central Asia. Alexander the Great and Genghis Khan came through this way, and the British feared German tanks would roll through here, so they placed tank stoppers in the riverbed. These are cement blocks that would impede the tanks' progress.