Are you planning a roadtrip through Europe or maybe the US for next year and want some ideas? Then the optimal roadtrip maps made by Randy Olson can perhaps help you, at least to get some ideas. After writing a post on how to best fin out where Waldo is he computed an optimal roadtrip through every state of USA (there’s also one with popular US cities), and then later one for Europe, using a list of 50 places worth visiting in Europe.
These roadtrips are calculated using genetic algorithms and search path optimization, and I found all three posts linked above to be interesting reads. He has also released the code to do this so it is possible to make a personal optimized roadtrip.