Not really Geocaching but it uses a GPS receiver and fits better here than any where else.
The goal of the project is to visit each of the latitude and longitude integer degree intersections in the world, and to take pictures at each location. I first read about this project in a Land Rover magazine but couldn''t take part, not having a GPS receiver. Before we went to Libya I bought one though so while there could claim a confluence. Actually some one else was there a month before us but didn''t take the required photos so we are in as the official "finders"