A part of the museum complex at the Pie-IX metro stop, along with Biodome, Botanic Garden and the newest addition - the Planetarium.
The insectarium is a small-ish exhibition of the above mentioned, though compactly contains lots of informative contents - everything from operational bee hives to still models of various insects species on displays. The really cool part is the live demonstrations where you get to hold certain insects and have the staff there explain the intricacies and uniqueness of the individual species to you. I feel like a kid again!