![The Discovery Files show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/014/590/small/the-discovery-files.jpg)
Summary: A new computer algorithm developed at the University of Washington uses hundreds of thousands of tourist photos to automatically reconstruct entire cities in about a day. The tool harnesses the increasingly large digital photo collections available on photo-sharing Web sites such as Flickr.