3. The Heartland

From the prairies to Canada's vast boreal forest that stretches almost from coast to coast, we reveal a huge wilderness of extremes that has been shaped over millennia by both humans and wildfires. Here pronghorn antelope, the fastest hoofed land animal on earth, still haunt the grasslands, the elusive wolverine thrives in the icy remote northern forests and beaver share their cozy lodges with grateful muskrats.