Some years ago we had the spontaneous idea to find a place to meet for a small family gathering. The plan was to find a place that is equally far away for all participants.
After a few discussions of how to tackle the problem mathematically correct, we actually got a simple solution for three participants. We declared the earth to be a flat disc and calculated the center of the circle on which all departure points lie. A point was therefore found very quickly! BTW, it was Bad Laasphe, Germany - a nice place to meet.
This website has been created based on this true story. It tries now to solve the problem a bit more comprehensive and mathematical though (as we all know the earth is not a flat disc, in fact the earth is very difficult to describe). Moreover we found some more models to calculate potential points to meet.
The positive side effect: you will get to places that you would have probably never seen otherwise.
Just copy the link and send by email, or save as bookmark.