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American brothers Peter and David Kunst arrive in Delhi, India, three years into their unprecedented journey round the world on foot, 11th June 1973. The brothers estimate they will have to walk for another year before they arrive at their starting point, Waseca, Minnesota, U.S.A.. (Photo by Keystone/Hulton Archive/Getty Images)

American brothers Peter and David Kunst arrive in Delhi, India, three years into their unprecedented journey round the world on foot, 11th June 1973. The brothers estimate they will have to walk for another year before they arrive at their starting point, Waseca, Minnesota, U.S.A.. (Photo by Keystone/Hulton Archive/Getty Images)