Middle-earth has gone digital. Google and Warner Bros. Pictures have collaborated on a "Chrome Experiment" that maps out author J.R.R. Tolkien's fantasy world in advance of the Dec. 13 release of "The Hobbit: The Desolation of Smaug."

"Chrome Experiments" are aimed at showing what's possible with a browser. The new online interactive map, complete with atmospheric moving clouds, provides a guided tour of Tolkien's Middle-earth, the setting for "The Lord of the Rings" and "The Hobbit,"...