The Bay of Fundy in Canada has the highest tidal range in the world. To get a glimpse of this natural wonder in action, I visited the famous Hopewell Rocks in New Brunswick on two consecutive days. The first photo below was shot at low tide, while the second was shot at high tide. The visual comparison would have worked better if I had shot both photos from the same angle, but you can still see that all of the people in the first photo would be underwater in the second photo.
You can view more featured photos at my Photo of the Day Collection.