Fodor's Expert Review Ida Davidsen

This five-generations-old, world-renowned lunch spot is synonymous with smørrebrød, the Danish open-face sandwich. The often-packed dining area is dimly lighted, with worn wooden tables and news clippings of famous visitors on the walls. Creative sandwiches include the H. C. Andersen, with liver pâté, bacon, and tomatoes. The terrific duck is smoked by Ida's husband, Adam, and served alongside a horseradish-spiked cabbage salad.