Great Barrier Reef
Recently, Outside Magazine ran an obituary for the Great Barrier Reef, declaring it dead at 25 million years old. But scientists (and social media) were quick to point out the gorgeous natural wonder is not actually dead. Rising ocean temperatures, water pollution, ocean acidification and cyclones continually pummel the reef and have caused mass coral bleaching. So it's in trouble, yes, but definitely still alive.
Recently, the 133,000-square-mile reef system has become a "last chance" tourist destination, where visitors travel there to see it before it's gone. What took 8,000 years for nature to create could disappear within our lifetimes.