In November, Google launched a 3D tour of Ancient Rome, circa 320 AD. The tour, produced with the help of the Rome Reborn project at the University of Virginia, features over 6,000 buildings, some rendered in fine detail, and it includes some interiors as well. The Colosseum, the Roman Forum, the Basilica Julia, the Temple of Vesta -- they're all there. The video above introduces you to the tour, and shows you how to access it on Google Earth. (The software can be downloaded here). I should note that Google just held a competition that let educators develop history lessons (aimed at high school students) using elements of the 3D Tour. The winners and their lessons can be found here.