Right from my Engineering days I am always been attracted by the technology called GPS.
GPS will gives your location on the earth in terms of latitude & longitude.
So whenever I will have some time I will search on the internet for the new things with the GPS technology. Today while searching I got a very good web-side, http://www.nhc.noaa.gov/gccalc.shtml which will calculate the distance between two location from there latitude & longitude information.
You can find out your city’s latitude & longitude information here (if available)