In my opinion, a pretty useful application of 3D printers.
(And a great idea for a startup)
Under the cut there are a couple of giant photos and description Japanese service
Japanese service offer 3 steps to print a 3D map of the area.
Step 1: Choose a location
Step 2: Admiring 3d model
Step 3: Print on a 3d printer
And a few photos from their website