This massive field of hard, limestone rocks are what’s left of the deadliest rockslide in North America, after 110 million tons broke from the unstable Turtle Mountain, sweeping down the mountainside and pummeling part of the mining town of Frank, Alberta.

In this video, we’re exploring the site of the disaster, looking for what is left behind of this once booming town, and visiting the Frank Slide Interpretive Center to see what stories we can learn and remember. This is the town of Frank, Alberta, in mid-west Canada, and this is the story of the terrible Frank Rockslide.

I’ve explored several ghost towns across North America, but this town’s history ranks among the most dramatically gripping stories I’ve looked into, right up there with the underground fires of Centralia, Pennsylvania.