> Montreal has a similar system, while Tokyo, Osaka, Seoul, Hong Kong, Singapore and Houston have systems that resemble the Path in some respects. A few Europea

> Montreal has a similar system, while Tokyo, Osaka, Seoul, Hong Kong, Singapore and Houston have systems that resemble the Path in some respects. A few European cities also make considerable use of pedestrian tunnels, including Helsinki, Stockholm and Munich. Japan's northernmost major city, Sapporo, has a very extensive one -- of those I've seen, it's the one that's most comparable to Toronto's. The other Japanese tunnel/undercity complexes are mostly subterranean malls around subway stations. (This also applies to all of the ones in Hong Kong.) But Sapporo's is seriously huge. I think the common denominator is that people would rather walk in a heated underground space when it gets cold.