The 20th anniversary of the operational implementation of dynamic routing in circuit-switched networks represents a unique opportunity to look back on a subject that generated so much interest around the world and to analyze the influence of such studies in the design of new networks. It is first useful to recall the objectives of dynamic routing, briefly describe the methods that were developed, and review the current status of these networks throughout the world. The introduction of dynamic routing obviously represented a revolution, which incidentally occurred on 14 July, 1984; on Bastille Day, which celebrates the French Revolution. Both revolutions aimed to introduce more freedom and fairness: fortunately, the revolution that occurred two decades ago did not result in any chopped-off heads, as did the first one. Instead, this article represents a tribute to all scientists and engineers who took part in this Routing Revolution and deserve hats off!