Wikipedia
Hemistour
Hemistour was a bicycle tour from Anchorage, Alaska, to Tierra del Fuego, Argentina, completed in part by Dan and Lys Burden and in full by Greg and June Siple from 1972 to 1975. Twenty-nine other cyclists joined the Burdens and Siples for parts of the trip, which totaled 18,272 miles (29,405.9 km).
National Geographic published an article about Hemistour, written and photographed by Dan Burden, in their May 1973 issue.