7 - Eleven is the world's largest operator, franchisor, and licensor of convenience stores with more than 50,000 outlets worldwide. The store started in 1927 and got its name because it opened from 7 a.m. until 11 p.m., which was considered to be "extended hours" back in the mid-1900s. 7-Eleven started to stay open for 24 hours on 1963 at a store in Austin, Texas. Read the story here: Open Around the Clock.

Here's an interesting read about 7-Eleven: 11 Facts About 7-Eleven on 7/11