Rounding up 500 enormous bison in a few weeks is no easy task. Just ask the wardens in Elk Island National Park of Canada who must wrestle with each one of these stubborn animals. Bison are ornery creatures that can plow through a wooden fence like it is balsam wood.

Up in Nahanni National Park of Canada, Senior Park Warden Barry Troke is leading an expedition of archaeologists looking for historical remnants along a park that straddles the tree line. In one of the most remote places in the Northwest Territories, they make a startling discovery. A primitive cabin cut into the side of a hill. Long deserted it harks back to a time when this park was as far away from civilization as the dark side of the moon.