This is pretty cool. The Degree Confluence Project is a global, public attempt to visit the precise location of every intersection of integer latitude and longitude (points of the form 47°00'00"N 9°00'00"E, for example). Anyone with a GPS device can take part. Each attempted visit, successful or not, is accompanied by photographs and a written account of the journey (often fascinating). It's the slightly quirkier and more pointless cousin of Geocaching.
A massive, distributed fool's errand? I don't think so. They may not ever cover every point of confluence on the planet, but they've already reached nearly 3,000 unique points (this one is my 'local', by the way) and created an interesting photographic sampling of the planet's surface geography.