The mystery Vegas casino you can only visit once every two years
Las Vegas is the gambling capital of the United States. It is home to, per About.com, about 200,000 slot machines across about 1,700 licensed gambling locations. Those "licensed gambling locations" aren't necessarily "casinos," though -- you can find slot machine at the airport, for example, as well as random other places throughout the area. If you really want to gamble in Vegas, it's pretty easy to find someone who will take your money. It can be a very lucrative business.