What If All The Ice On Earth Melted?
Race you to the top of Big Ben.
If all the ice on Earth melted, sea levels would rise by around 66m. Here's what that would look like in some familiar places.
Disclaimer: these images were all made using the technique described in this article by Andrew David Thaler and are rough approximations of what the world would look like underwater. In any case, this kind of sea level rise is thousands of years away at least.