New technologies have been driving the growth of cities for thousands of years, from the invention of agriculture and aqueducts to the steam engine and electricity. But while the urban innovations of the past restructured the physical world, today’s big breakthroughs work behind the scenes, sensing, shaping and revealing invisible patterns and new virtual spaces. Augmented reality (AR) is poised to reshape cities in ways that were unimaginable just a decade ago. This report, The Augmented City, by 2023 Urban Tech Fellow Greg Lindsay, examines both the exciting potential and the grave challenges posed by the integration of AR into urban life.