Culturally rich and historically complex, New Orleans often feels like its own museum. Unintentional exhibits are found in stumbled-upon courtyards, time-capsule bars, famous old restaurants and restored homes. The city's actual museums also go a long way toward preserving and celebrating its culture and history, too, and are staffed with people who love sharing fascinating facts (and artifacts).
Las Vegas globally is seen as the city of Sin and you can see this from depictions of media like movies. People get the idea that you can do whatever you want in Vegas and “happens in Vegas stays in Vegas” is a popular saying from pop culture.