A look at the unique wildlife of East Africa's volcanic mountains.
Film which explores the extraordinary ways in which people survive at extreme altitudes.
Brian Cox shows how a planet's size can make the difference between life and death.
Steve Backshall descends into the crater of a giant extinct volcano in New Guinea.
Where volcanoes come from, why earthquakes happen and where to find diamonds.
Cambridge professor Mary Beard provides insight into life in Pompeii.