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Sher Shah Suri constructed the Grand Trunk Road (GT Road) in the 16th century, connecting Sonargaon (Bangladesh) to Peshawar (Pakistan). This 1,500-mile highway was a marvel of medieval engineering, featuring rest houses (sarais), wells, and shade trees. It facilitated trade, military movement, and administrative control across northern India. Later Mughal rulers and the British maintained and expanded this crucial infrastructure.