Fast-food burgers are deeply engrained in American culture. White Castle flipped the first one in 1921–in its iconic square slider form, of course–and our world has been changed ever since. It wasn't ...

Related: 15 Best Slider Recipes White Castle started back in 1921 in Wichita, Kansas with a castle-shaped restaurant that featured a 5-cent burger on the menu. It's known as the first popular fast ...