The circumnavigation by Stan Mott of New York, who drove a Lambretta-engined 175-c.c. Italkart (with a ground clearance of two inches) 23,300 land miles through 28 countries from February 15, 1961, to June 5, 1964, beginning and finishing in New York.
Why did he do it? A bet over a cup of coffee!
Stan’s entire account of his adventures in PDF format, published in Argosy Magazine, November, 1964.