Titan is the biggest moon of Saturn and it is the only other place in the Solar System besides Earth where there is lakes and rivers (which are made of methane). Recently JRehling ((http://www.unmannedspaceflight.com/index.php?showuser=321) made an incredibly map of Titan's surface:
He used photos taken by the Cassini probe. I made a 3D version of it using Blender 3D: