How much money will a global travel cost

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I always have some idea that doesn't realistic,but I can't help.It is my dream for years to have a global travel,but until now I've not been a millionaire yet.My question is:can anyone figure out the minimum cost for a tourist to the main countries I like,such as USA,Canada,UK,France,Germany,Danmark,Egypt,Kenya,Japan,Korea,and maybe others.If I have know the figure of cost ,then I have a goal to achieve,and work hard with great passion...