According to the Guinness Book , through his work , he had travelled to every single sovereign country in the world ( which totalled 193 according to the Guinness Book ) by 20 February 2004 .
According to the Guinness Book , through his work , he had travelled to every single sovereign country in the world ( which totalled 193 according to the Guinness Book ) by 20 February 2004 , aged 28 years and 361 days .