Royal Castle is a restaurant that has been around since 1958. Back then, the Miami-born concept was a very successful chain with over 150 locations around the American south. Today though, there’s only one left and thankfully it’s still in Miami. The Royal Castle of today looks like a fast-food restaurant from the outside but feels more like a simple neighborhood diner inside. This place stays open 24/7 and has a basic breakfast menu, some sandwiches, and a T-bone steak, but what they’re famous for are the sliders. You can order them in “six-packs” with or without some pretty good crinkle-cut fries. The mini burgers have soft buns, thin patties, diced onions, a pickle, melted American cheese, and are good enough to make you understand why this place used to be such a success.