There are many things in this world that we take for granted.
We assume that because our great, great grandparents found them here and generations later, they are still here, and somewhat unchanged, then they are going to be here forever.
This is not the case at all. Taking the Seven Wonders of the World as a good example; they were here for many decades and even centuries. However now, all but one has disappeared.
They will not be seen again and generations will only have to read about them. So make sure you visit these 25 places before they are no more.