Mount Parinacota, Chile/Bolivia (11/20)

This dormant twin volcano straddles the border between Chile and Bolivia, towering over the high-altitude Altiplano region. Mount Parinacota offers an unforgettable trekking experience for those brave enough to summit it. The surrounding area is filled with high-altitude lakes, salt flats, and ancient ruins, making it an exceptional destination for those seeking both natural beauty and cultural history.