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The Sensual Berri cocktail at Rhumbar.
Some claim that the height of cocktail creation came in the late 1800s to the early 1900s. Bartenders were pouring more than the average beer or Scotch and pairing exotic ingredients with spirits from across the world. Then a perfect storm of events stunted further growth of the industry when Prohibition was enacted and the Great Depression made people worry more about their next meal than what they were mixing with their whiskey.
read more here: http://blog.vegas.com/las-vegas-nightlife/mixing-things-up-bartenders-in-vegas-concocting-creative-cocktails-16576/