It is a sad fact that many of the natural wonders of the world are slowly fading away. The most obvious reason for this is climate change, which is melting and eroding some of nature's most stunning landmarks. However, global warming isn't the only factor.
Some of the world's oldest natural wonders were actually ruined by humans who pushed them over, drove into them, or cut them down. And for others, they were so precarious to begin with that gravity finally won.
So, which natural wonders will you never get the chance to see? Click on to find out.