You can use the Google Maps Distance Calculator to find out the distance between two or more points anywhere on the earth. In other words, the distance between A and B. Click once on the map to place the first marker and then click again to position the second marker. The distance between the points should then be displayed. You can also build up a series of locations to find a total distance. The main drawback to this tool is that is as the crow flies, so traveling in real life will normally involve larger distances.