Google announced the launch of a it’s new 3D layer for Google Earth. By far it is one the most extensive collection of three-dimensional buildings at on GE location. The model depicts Rome in the year 320 AD – at the peak of its development with over a million inhabitants. At this time it was the largest metropolis in the world and it wasn’t until Victorian London, 1500 years later, that another urban city surpassed Rome. Because of its size and importance, Rome may be one of the most-studied cities in history.