What began almost 60 years ago as Walton's, a single five and dime store, has morphed into the world's largest retailer. Walmart is now valued at $417.8 billion (£300bn) and has more than 10,500 stores in 24 countries worldwide. Read on as we take a look back at how the father of Walmart Inc., Sam Walton, started the Walmart empire and how his family continues his incredible legacy today. All dollar values in US dollars.