Ice Age era caves found below the Canadian city of Montréal

When you think of a city you usually think of the surface, criss-crossed by streets and lined with buildings. However, you often don’t think of what goes on below the surface. What if you found out that there was a large network of caves hiding underneath your city? That is what the residents of Montréal have learned; a network of

from ZME Science http://ift.tt/2jdT9n8