The Shire is a stunning and lushly lovely Second Life sim which, as the name suggests, is a tribute to Tolkien's greenest part of Middle Earth. Here's what it looks like from the longest view:
That tiny white spot in the middle-upper left is me, which should give you an idea of the scope of the place.
Click here to see it on the Second Life web map, or copy/paste this address into your favorite SL viewer: http://maps.secondlife.com/secondlife/The%20Shire/143/152/33
As with Tolkien's novels, part of The Shire is devoted to Hobbiton, which is represented by cave-like homes, while other regions evoke other places. (I think the spot where the hobbits and Strider fight a Ring Wraith, which here also does double-duty as a nightclub spot.) The textures are lush and superbly detailed. For instance, the hobbit homes have glass windows which shift as you look inside: