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Chacaltaya is a peak in the Andes Mountains, Bolivia, at 5,421 meters above sea level, known for its ski resort, which was the highest in the world at 5,395 meters above sea level. Located near La Paz, the steep access is followed by a 200-meter path. The resort, now closed due to climate change, attracts tourists mainly in summer for skiing. There are plans to study a new station at higher altitudes. Furthermore, the peak houses the Chacaltaya Astrophysical Observatory, important for cosmic ray research.