From the New York Times architecture critic, his celebrated walking tours of New York City, now expanded, covering four of the five boroughs and some 540 million years of history, accompanied by some of the people who know it best. As New York came to a halt with Covid, Michael Kimmelman composed an email to a group of architects, historians, writers, and friends, inviting them to take a walk. Wherever they liked, he wrote preferably someplace meaningful to them, someplace that illuminated the city and what they loved about it. At first, the goal was distraction. At a scary moment when everything seemed uncertain, walking around New York served as a reminder of all the ways the city was still a rock, joy, and inspiration. What began with a lighthearted trip to explore Broadway's shuttered theater district and a stroll along Museum Mile when the museums were closed soon took on a much larger meaning and ambition. These intimate, funny, richly detailed conversations between Kimmelman and his companions became anchors for millions of Times readers during the pandemic. The walks unpacked the essence of urban life and its social fabric the history, plans, laws, feats of structural engineering, architectural highlights, and everyday realities that make up a place Kimmelman calls humanity's greatest achievement.