Google's "Ancient Rome 3D"

The Official Google Blog reports on the launch of
Ancient Rome 3D, a layer of Google Earth where
"everyone in the world, from Rome itself to Calcutta,
can now travel through time and discover Ancient
Rome as it was 1,688 years ago when it was ruled by
Emperor Constantine."

Ancient Rome 3D includes more than 6,700 buildings of
Ancient Rome rebuilt in 3D. Inside of the Rome 3D layer of
Google Earth, you can "fly into Rome as it looked in 320 A.D.;
tour the interior of famous buildings; visit sites such as
the Roman Forum, Colosseum and the Forum of Julius Caesar;
and learn about how the Romans lived."

To access Ancient Rome 3D, you must install Google Earth
4.3 on your computer.