BBC Earth HD

'S1/E6 - Railways and Imperialism'. The invention of railways coincided with the period of European colonisation. A look at how the Europeans used railways to further their imperial ambitions in other parts of the world.

'S3/E1 - Turkey: Delights of the East'. In Bodrum, Bettany gains unprecedented access to the tomb of a 4th century BCE dynasty leader. And she investigates exciting new developments at the world-famous site of Troy.

'S1/E1'. Dara O' Briain explores the ways in which the moon shapes just about everything around us, and why there's now a new race to get humans back to the surface of our satellite.

'S1/E2 - Utah'. Ben heads back to Utah, where he first met twin brothers Bill and Bob Stone, 3 years ago. He re-joins these canyon-dwelling renegades in their remote home, but this time, only one of them is living there.

'S1/E1 - Winter Is Coming'. See the long, dark, frozen winters to sweltering, bug-infested summers in remote Canada.

'S1/E7 - Railways and War'. Michael has travelled through two centuries of history aboard some of the world's most spectacular railways. Michael shares his thoughts on the role of railways in war.

'S1/E3 - Get Some Number 8 Wire: Wellington to Lake Coleridge'. Griff arrives at the South Island and heads deep into the interior.