Underground maze swallows more streets, buildings every year
                                
                                
                                    (Newser) -
                                    Welcome to Rome, where every year more streets and parts of buildings are collapsing into ancient passages that lurk half-forgotten underground. The city's proposed fix: map the labyrinth, detect the weakest spots with 3D scanning, and seal off the worst offenders,  LiveScience  reports. Successful or not, it may improve...