Walmart capitalized on international travelers' awe.Ben Shimkus/Business InsiderInternational World Cup fans have fallen in love with some very American brands, including Walmart.The big box store has been hosting tours to cash in on the attention.I went to the final tour the day before the World Cup final.A Walmart Supercenter is a fluorescent palace of American consumption.To US shoppers, it's a utilitarian one-stop shop where groceries, telev…