Bill Nighy narrates the stories of epic train journeys that cross the most beautiful mountain landscapes on the planet, from Canada's Rockies to the snowy peaks of Switzerland and the gorges of Mexico.

Deep in Alaska, the primal way lives on. Fight the freeze, brave the wild, hold on to your sanity. And winter is no wonderland when temperatures plummet far below zero. This series follows the drama and hardships experienced by Alaskan households in different corners of this merciless territory as they battle to survive, thrive, and live life on their own terms.

Nazaré in Portugal is the site of the biggest ocean waves ever recorded on Earth. To understand what creates these monsters, we use specialist jet-ski cameras to ride the waves.

Gregg Wallace and Cherry Healey hit factory floors across Britain for a snoop around their supersized production lines. What are the secrets behind our supermarket staples?