At the point where the Prime Meridian and the Equator intersect, there is an island that appears to see quite a bit of traffic—a surprising fact, considering that it doesn’t exist. Sometimes, when uploading a photo to a website, tagging a post to a location, or writing an article for a popular travel website, you’ll find that the address you’ve entered leads to a location in the eastern Atlantic Ocean, off the coast of Africa. Closer inspection will reveal that this place has the distinctive coordinate set of 0°N 0°E,…