Waldorf salad was invented in the late 1800's by Oscar Tschirky, who at that time was working at the Waldorf-Astoria Hotel. Originally it consisted of only apples, celery, and mayonnaise; the walnuts (and sometimes chicken) were added later.

As for the croissant, historians have recently begun to question the long held belief that it was created by Austrian bakers in the late 1600's, to celebrate the defeat of the Turks. However, it's highly unlikely that French nobles were dining on croissants during the reign of Marie Antoinette. As for the Caesar Salad, there are two stories surrounding its origins. In one version, it was invented in 1924 by Tijuana restaurateur Caesar Cardiniit. In another, it was created in the United States in 1906, and named in honor of the Romans. Finally, while revisionist historians still debate whether or not Marco Polo actually reached Asia, it's pretty much accepted that the Italians were already dining on pasta before his famous voyage. 

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