The green gem in the heart of Madrid is Retiro Park, which was bestowed on the public by the monarchy in the late 19th century. Whatever the season, the park is a top destination for locals and travelers alike: be it to cool down on a sweltering summer’s day with a picnic in the shade, or to soak up the autumnal atmosphere among the golden leaves. There’s a boating lake, dozens of sculptures, a beautiful rose garden and the magnificent Palacio de Cristal (Crystal Palace), a glass pavilion that holds free art exhibitions.