Subterranean Sites in Ontario

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

Abandoned for over a century, this chilling train tunnel is now a destination for ghost hunters.

One of Mother Nature’s geological gems, home to many prehistoric fossils.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

A neutrino detector built into the largest man-made underground cavity in the world.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

Canada's subterranean Cold War museum has doubled as a movie set.

Lost subway station nestled beneath Toronto's busy commuter line.