TV Guide PBS America Friday

Paul Murton heads to the northernmost spur of Skye, the Trotternish Peninsula, which has a distinct identity of its own - almost as if it were an island within an island. He begins his adventure at one of the star attractions of this part of the island, the Old Man of Storr and his journey into the geological past sees him follow in the footsteps of the dinosaurs who once walked this land

The Battle of Alesia, contested in 52 BC towards the end of the Gallic wars, in which Roman forces under the command of Julius Caesar besieged Alesia, within which sheltered a confederation of Gallic tribes united under the leadership of Vercingetorix of the Arverni. After six years of fighting, almost 200 000 warriors came together on the plain. One of the greatest battles in Antiquity was about to commence

Docu-drama about the 1918 Flu pandemic, which killed more than 50 million people. Using dramatic reconstruction and eyewitness testimony from doctors, soldiers, civilians and politicians, this one-off brings to life the onslaught of the disease and the horrors of those who lived through it. Narrated by Christopher Eccleston

Examining the struggle the residents of Los Angeles have faced for clean air after smog descended in 1943, including years of scientific study and civic pressures that would lead to the EPA and the Clean Air Act