Dr Sarah Parcak heads to Egypt in an attempt to uncover lost cities beneath the sands. (R)
15/25 Gus, a three-month-old North American grizzly bear, who lives with his mum and brother. (R)
3/4 Paul Rose heads to the North Pennines and enjoys white-water rafting down the River Tees.
Cyfle arall i weld hanes llafar yr Ugeinfed Ganrif yn Nhalaith y Chubut, Yr Ariannin. O... (R)
England's highest mountain as seen by its farmers, climbers and conservationists. (R)
3/3 The team search for tigers in northern Burma and in Karen State in the far south. (R)