Universal Pilgrimage

Why do humans feel the urge to walk long distances in the act of pilgrimage? What intangible force compels them forward through strange lands, interminable weather, exhaustion and pain? I don’t know exactly but if you don’t feel the urge to make pilgrimage, I feel sorry for you. For the same force that moves the Milky Way across the heavens, should be gently drawing you along in its celestial wake.