US troops may have left Vietnam about 40 years ago, but US tourists continue to return in a big way. Americans spent $100 million in the country last year, making it the top source of tourist dollars for the nation, reports the Vietnam News Agency. South Korea ($82.6 million) and Australia ($82.1 million) were the next closest. Don't be surprised if Russia makes the top three next year: A separate report at VietnamNet says visits from Russians are booming—170,000 in the first seven months of the year, up 57% from last year. (It didn't have a dollar figure for comparison's sake.)