The western side of the city is home to the Barranca del Cupatitzio National Park, the second most-visited national park in Mexico. Despite being almost completely surrounded by the city, the park contains trees hundreds of years old, springs, streams, canals and walking paths. The park focuses on the conservation of the ravine which forms the headwaters of the Cupatitzio River, which is fed by various springs and streams starting with the “Rodilla del Diablo” (Devil's Knee) . According to local myth, Juan de San Miguel forced the Devil to bow before the Cross, with the Devil's knee making an indentation in the rock from which the first spring emerges. The land was private until the 1930s when the federal government bought it to create the park. The ravine has various waterfalls such as La Yerbabuena and El Golgota, bridges and fountains that take advantage of natural water supply. There is also a mural called Erédira by local artist Manuel Pérez Coronado, but it is almost completely deteriorated.