She hit the jackpot and won $11.8 million.ĩ. In 1994, a 67-year-old retired flight attendant from Las Vegas was playing the Megabucks slot machine at The Mirage Hotel and Casino. In this article, we will take a look at the 10 biggest jackpots ever hit in Las Vegas.ġ0. The city is home to some of the world's most famous casinos and has seen some of the biggest jackpots in history. Las Vegas has long been known as the gambling capital of the world, and for good reason.