The University of Washington, which licensed to Microsoft the photo-stitching technology used in the Photosynth, has come up with a revamped algorithm of “Photo Tourism and Skeletal Sets” that can be used to model not just individual landmarks but now entire cities using tens or even hundreds of thousands of photos, reports. For more detail, read this piece by UW engineering writer Hannah Hickey, and this page provides more information on the overall project. Microsoft Research, Google, the National Science Foundation and the Office of Naval Research supported the research. In the video, model of the Colosseum, was constructed from 2,106 images, that were downloaded from the photo-sharing website, Flickr. This particular video shows the overall view, but users would be able to zoom into individual images, as well.