Uturuncu (Bolivia)
This high-altitude giant has been rising 0.7 inches yearly since the 1990s, concerning scientists. Standing at 19,700 feet above sea level, it dominates the Altiplano landscape. Pink flamingos feed in nearby mineral-rich lagoons. The barren volcanic slopes contrast with colorful desert plains. Though its last eruption was 250,000 years ago, the unusual ground swelling suggests magma accumulation beneath.