In Montreal, we have the largest underground complex called "The Underground City". It's a series of tunnels of a total of 32 km that allow going almost everywh

In Montreal, we have the largest underground complex called "The Underground City". It's a series of tunnels of a total of 32 km that allow going almost everywhere downtown (add to that the subway and soon the electric train, we could say almost everywhere in the city) without going outside.