Cities now stand at a crossroads. During the global COVID crisis, cities grew silent as people worked from home—if they could work at all. The normal forms of socializing ground to a halt. How permanent are these changes? Are we on the brink of a post-urban world? City life will survive but individual cities face terrible risks, and a wave of urban failure would be absolutely disastrous. It is possible to drive a city into the ground, pandemic or not. Glaeser and Cutler examine the evolution that is already happening, and describe the possible futures that lie before us: What will distinguish the cities that will flourish from the ones that won’t? In America, deep inequities in health care and education are a particular blight on the future of our cities; solving them will be the difference between our collective good health and a downward spiral to a much darker place.