Daily from 7.00pm.
Programmes start at 7.00pm.
Armed with his 1899 Appleton's Guidebook to Alaska, Michael Portillo begins his journey amid the snow-capped mountains and ice-cold inlets of the Kenai Peninsula. Show more
Samira Ahmed reveals how Iran preserved its distinctive language and culture despite the Arab conquest of Persia. Show more
Professor Stephen Hawking, Professor Danielle George and Christophe Galfard join forces to find out if, and how, humans can reach for the stars and relocate to different planets. Show more
Clydebuilt: The Ships That Made the Commonwealth
Episode 4: HMS Hood
59 minutes on BBC Four HD
Available for years
David Hayman meets men who sailed on HMS Hood and travels to Scapa Flow to experience what life was like for those people working to protect vital North Atlantic convoys. Show more
This listing contains language that some may find offensive.
Series exploring the Celts looks at the golden age of the La Tene Celtic warrior. But by the middle of the first century BC, the Celts were under threat from the Roman Empire. Show more
Armed with his 1899 Appleton's Guidebook to Alaska, Michael Portillo begins his journey amid the snow-capped mountains and ice-cold inlets of the Kenai Peninsula. Show more
Samira Ahmed reveals how Iran preserved its distinctive language and culture despite the Arab conquest of Persia. Show more
Programmes start at 7.00pm.