The Continental Divide is essentially the point at which the US waterways split - the water on one side runs down to the Pacific Ocean, and the water on the other runs to the Atlantic. We crossed the Divide three times in Yellowstone.
At Craig Pass, Isa Lake actually drains into both oceans at once! (Granted, it should be called Isa Pond, since it's not that big.)
But it was hard to get a photo: there were elderly people wandering aimlessly around the sign and blocking it from view!
When we stopped at the next sign, I took a photo. I turned around - the same people were advancing rather fast. I almost, but not quite, ran.