Montreal's underground city is an ingenuous network of tunnels connecting office towers, malls, metro stations, universities, and hotels. These 33 kilometers of walkways and 120 access points are nestled under street level. Montrealers and visitors use them on rainy and snowy days. Urban planning just doesn't get smarter or more adaptive than this.
The network stretches under downtown, from Place des Arts to Palais des Congrès, and then to the Eaton Centre and Bonaventure metro station.