This legendary eatery is renowned for the creation of a little sandwich you may have heard of; it's called the hamburger. The birthplace of the iconic all-American ground-beef delicacy, this restaurant has been using the same Louis' burger recipe since its establishment in 1900. The restaurant, like the burger prototype, remains impressively unchanged, sporting dark-wooded booths littered with scratch-graffiti, vinyl bar stools, and arched red shutters -- the place is nothing if not authentic. Beyond the classic addition-free burger (none of this bacon, cheese, avocado nonsense) the menu exclusively offers sides of potato salad, and slices of the homemade pie of the day. Needless to say, the simple, purist menu is as iconic as it is limited.