Las Vegas is most famously known as "Sin City," a nickname it earned in the early 20th century. Specifically, in the early 1900s, the "Block 16" and "Block 17" districts became notorious for legal prostitution, the illegal sale of alcohol during Prohibition, and high-stakes gambling. The name stuck as the city evolved into a global hub for vices that were often restricted or illegal elsewhere. Over the decades, the presence of organized crime and the "anything goes" atmosphere of the Las Vegas Strip solidified this identity. While the city has made significant efforts to market itself as a family-friendly "Entertainment Capital of the World" since the 1990s, the "Sin City" moniker remains a powerful brand for those seeking the ultimate escape into the world of casinos, world-class nightlife, and adult-oriented entertainment.