This museum is a really cool place to check out.
There is so much to learn here about the Chicago Mob and its influence on Las Vegas. It has a comprehensive history on the Mob and the police efforts to squash them. It shows information about all of their illegal activities and has this cool room with stacks of money to show you how much they skimmed from the books and hid from the government.
It is three stories and you walk through it at your own pace. I made the mistake of going right before lunch, not realizing that it takes some time to read through everything and see everything and had to stop for a snack at the gift shop. Eat lunch beforehand and enjoy!
The gift shop is one of the best that I have seen at these in town exhibits. I will also note that they recently donated a million dollars or something to the city of Las Vegas which makes me like them even more.