8/8 James Aldred visits the Grove of Titans and climbs the world's tallest tree.
BBC Radio 4
BBC Radio 4 FM
7/8 James Aldred travels to California in search of the world's biggest trees.
6/8 Wildlife sound recordist Chris Watson explains how landscape paintings have inspired him.
5/8 Wildlife sound recordist Chris Watson travels to India to record the roar of a tiger.