Hidden River Cave was once filled with heavy metals and sewage that made the surrounding town smell awful. After a cleanup, it became a tourist draw. Source link : https://www.nytimes.com/2025/08/20/climate/horse-hidden-river-cave-pollution-cleanup.html Author : Hiroko Tabuchi and Jason Gulley Publish date : 2025-08-21 09:07:00 Copyright for syndicated content belongs to the linked Source.