The mighty river Indus marked the final frontier of Alexander’s great empire. Little did he know, that this river has seen a great civilization flourish on its banks, three thousand years before he invaded from the Khyber Pass. The land, which is now Pakistan, was the centre of Buddhism, a seat for the Mughal emperors and home to the mystic Sufis. Up in the north, its mighty mountains clad with eternal snows gave way to the southern branch of the once-fabled Silk Road. Exploring Pakistan, its diverse peoples, festive cultures, towering mountains, deserts and lush plains is like exploring the secret of Asia.