Visual Traceroute will show you, on a map, the path your data travels to any server in the world. Very easy to use, just enter the server's name and press go.
Visual Traceroute will use the 'ping' command available on most devices to determine the path your data travels, and will then use a database to look up the geographic location of this path. If your device is rooted, Visual Traceroute will use 'nmap' instead of 'ping', which provides for better and faster (UDP based) host detection.
Some routers block 'ping' (ICMP), and you will need a rooted device in this case. Some devices do not have 'ping' installed on them, and you will need a rooted device in this case too. The app will notify you in this case.