La Casa del Abuelo is a historic bar in Barrio de las Letras, Madrid, known for its famous gambas al ajillo (garlic shrimp). The bar has been serving this iconic dish since 1906, and it has become a must-try for locals and tourists alike. Apart from the delicious shrimp, La Casa del Abuelo also offers a variety of drinks, including wines, beers, and spirits. The atmosphere in the bar is cozy and nostalgic, with vintage decor and old photos on the walls. If you're a seafood lover or simply looking for a taste of Madrid's culinary history, La Casa del Abuelo is a must-visit.