For a while now I have been looking for a map of Tamriel or all of Nirn. something in high resolution printed in the same way as the official maps for Skyrim or Cyrodiil would love it if Bethesda made a full sized lithograph or an official print of the sort, but I have been unable to find any such thing. I have a slight obsession with this universe and maps so I wan't one for above my mantle.

http://www.imperial-library.info/content/tamriel-maps is your best source for this (and anything to do with TES lore). They have every single official map of Tamriel ever, and a few non-official ones to boot. A warning, however: the shape of Tamriel has drastically changed as the series has gone on, and many official maps openly contradict each other. Personally I steer closer to Daggerfall-Redguard-Morrowind era maps than later ones, as they are more convincing/