Top 10 Cities with the Longest Underground Commercial Pedestrian Networks

Underground Cities: The City's Second Lifeline

• Gifts of the North: Top-ranked cities like Montreal and Toronto are located in high-latitude regions, where underground networks serve as essential sanctuaries from extreme winter weather.
• The Asian Model: Tokyo and Seoul leverage extreme rail transit density to turn underground streets into high-frequency living spaces, leading the world in commercial and human traffic density.
• Statistical Complexity: Because many underground networks are built in phases under fragmented management, 'total length' often includes long-term master plans. These systems are evolving toward 'all-weather underground wandering'.