Take a thrilling journey to four of the greatest national treasures of Europe and Africa. Walk along the misty shores of Ireland's rocky northern coast to experience the legendary Giant's Causeway. Search for elusive mountain gorillas in Uganda's lush Impenetrable Forest. Climb the stunning snow-capped peaks of Italy's timeless Alps to discover the regal ibex in Gran Paradiso National Park. Behold the spectacle of thundering herds of migrating wildebeest, zebra and gazelle on Africa's fabled Serengeti Plains.

• Documentary