If you're looking to venture outside of Retiro subway station, there are several nearby attractions worth exploring. Take a short walk to the iconic Retiro Park, where you can stroll through its beautiful gardens, visit the Crystal Palace, or rent a rowboat on the lake. Alternatively, you can visit the nearby National Archaeological Museum or the Puerta de Alcalá, a stunning neoclassical monument. Rainy afternoons can be the perfect time to visit these attractions, as they may be less crowded.