Every year more than 100 million people around the world go on pilgrimage, the biggest mass migration of people on the planet. Two and a half million Muslims visited Mecca for last year's Hajj and over 600,000 visited Graceland to worship at the shrine of Elvis Presley. Tourist companies specialising in pilgrimage tours are expanding - it's big business. Ernie & his guests discuss whether there is something in the human psyche which seeks fulfilment from a physical journey, but one that has a spiritual motive, and also consider the growing phenomenon of cyber pilgrimage. Can a "virtual" journey in any way be seen as comparable?