Mapping The Newest Old Map Of The World: A full-sized, 3D plaster relief facsimile of the Hereford Mappa Mundi, the largest surviving medieval map of the world (Previously).
Durango Bill's Home Page. With topics that include: 3D end-to-end tour of the Grand Canyon, the origin and formation of the Colorado River, and examples of river systems that cut through mountain ranges instead of taking easier routes around them in Ancestral Rivers of the World. [more inside]
3D Starmaps by Winchell Chung. (I knew him for his game illustrations before I ever knew about his starmaps.) The site contains lots of information about how to make 2D/3D starmaps from standard star tables, a nice selection of pre-existing maps and one of the best listings of 3D starmap software around.
Use the free 7 day trial while it's available! This lil program lets you zoom in pretty darn close on just about any spot in the world. And it is FREAKING COOL. I don't have much better commentary than that, sorry. You can zoom around to your favorite locations, tilt the camera, show all road names, rotate views - and once you've got a bunch of stuff plugged in its really neat to just click between them and watch the flyby. I can't believe this isn't a double post, but couldn't find it on search. Have fun!
3-D Maps of Nearby Space "The first detailed map of space within about 1,000 light years of Earth places the solar system in the middle of a large hole that pierces the plane of the galaxy...The new map, produced by University of California, Berkeley, and French astronomers, alters the reigning view of the solar neighborhood." (one view|another view|links to bigger images)