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Kevin Costner retraces the steps of the Hayden expedition as he explores the wildest terrain of Yellowstone National Park.

Kevin Costner explores the park in the dead of winter, battling fifteen feet of snow and negative 40-degree temperatures.

As the snow melts, millions of animals return to the park, but this year they're accompanied by a flood of biblical proportions.

Kevin Costner takes a deep dive into the 10,000-year human history of Yellowstone.