While travelers have time and again rated their favorite cities, we have a group of scientists tell us the best one this time! And according to them the most beautiful city in the world is the walled Roman cathedral city in England – Chester! The study was conducted by Online Mortgage Advisor wherein researchers scanned Google Street View for front-facing photos of hundreds of streets and more than 2,400 buildings in historical cities worldwide – as also stated by lbc.co.uk.