From an Australian fire that's been continually burning for millennia, to earthquakes that shake the ground for centuries, here are four natural disasters that lasted way longer than you might have expected.

What happens when your entire country starts to disappear? We visit six Pacific Island nations—Vanuatu, the Marshall Islands, Nauru, Palau, Samoa, and Kiribati—facing exactly that. We break down the science, the human stories, and the...