I've never been to Las Vegas but I love it in concept because it sounds so made up. Imagine if you were reading a fantasy novel and they were like "smack in the middle of a deadly inhospitable desert there is a glittering city of indulgence and lawlessness and cheap sin that has specifically engineered itself to obfuscate your sense of time and keep you there as long as possible while they take all your valuables." You'd be like yeah that's some wizard shit.
One time, I was trying to think of a fun way to have a Las Vegas style location in a D&D campaign, so I googled Las Vegas D&D and found a thread where someone in Vegas wanted to run a module. The thread was titled "Curse of Strahd in Las Vegas", and that sent my mind to some interesting places.
Ooooo that's good. Now I just need to figure out which casino would be Strahd's castle. Caesar's Palace seems fitting. Though I'd probably go alternate universe Vegas so I could retheme things more appropriately.