The Grand Trunk Road is one of South Asia's oldest and longest major roads. For more than two millennia, it has linked the eastern and western regions of the Indian subcontinent, running from Chittagong, Bangladesh through to Howrah, West Bengal in India, across north India into Peshawar (in present day Pakistan), up to Kabul, Afghanistan. Its former names include UttaraPatha ("Northern Road"), Shah Rah-e-Azam ("Great Road") or Sadak-e-Azam or Badshahi Sadak.
(http://upload.wikimedia.org/wikipedia/commons/7/7b/Route_of_grand_trunk_road.png)
East end: Chittagong
West end: Kabul
Source: http://en.wikipedia.org/wiki/Grand_Trunk_Road