BBC Earth HD

'Agatha Christie: Lucy Worsley On The Mystery Queen. S1/E1 - Cat Among the Pigeons'. Lucy Worsley uncovers the origins of Agatha Christie's macabre magic and, with some compelling characters, reveals carefully concealed secrets.

'Agatha Christie: Lucy Worsley On The Mystery Queen. S1/E2 - Destination Unknown'. Lucy Worsley uncovers the origins of Agatha Christie's macabre magic and, with some compelling characters, reveals carefully concealed secrets.

'Agatha Christie: Lucy Worsley On The Mystery Queen. S1/E3 - Unfinished Portrait'. Lucy Worsley uncovers the origins of Agatha Christie's macabre magic and, with some compelling characters, reveals carefully concealed secrets.

'Big Adventures: Into Thailand with Sue Perkins. S1/E1'. Episode one of Sue Perkins' Lost In Thailand opens in magnificent Northern Thailand where Sue explores the breath-taking beauty of the Thai Highlands.

'Sue Perkins' Big Adventure: Paris To Istanbul. S1/E1'. In Paris, Sue samples insects and absinthe, models for Paris Fashion Week, and crashes a cabaret.

'Joanna Lumley's Danube: Europe's Mightiest River. S1/E1 - Germany and Austria'. Joanna's emotional exploration begins at the river's source, Germany's Black Forest mountains, and marks two key anniversaries.

'Joanna Lumley's Danube: Europe's Mightiest River. S1/E2 - Slovakia and Hungary'. Joanna discovers that the 'blue Danube' is both a constant reminder of Europe's unchanging beauty, and the thread that keeps it powerfully connected.

'Joanna Lumley's Danube: Europe's Mightiest River. S1/E3 - Budapest'. In Budapest Joanna explores the river by boat and rides a unique children's railway, as well as discovering the city's Jewish heritage.

'Joanna Lumley's Danube: Europe's Mightiest River. S1/E4 - Romania'. Joanna heads towards the Danube Delta, one of the last great wilderness areas remaining in Europe, full of birdlife including the majestic Pelican.

'S1/E1 - The North'. In Varanasi, Bettany takes part in a Hindu ritual which helps her process her own bereavement. She also takes a boat out to the Lake Palace on an island in Lake Pichola.

'S1/E2 - The South'. Bettany enjoys the breath-taking journey through the Tamil Nadu hills, between Mettupalayam and Udhagamandalam (Ooty).

'S3/E4'. The teams travel through the breathtaking beauty of Costa Rica, a country that contains five per cent of the world's biodiversity, before reaching Panama, the seventh country of the race.

Astronaut Eileen Collins was the first woman to pilot and command a spacecraft. She smashed many glass ceilings in the US Air Force and at NASA during her career.

'S1/E4 - Friends Forever'. Far from their home planet, those aboard the International Space Station face the emotional realities of isolation, while relationships are tested when war breaks out on Earth.

'Queens of Combat: Rome's Female Gladiators. S1/E1'. What if women were hidden among the ranks of Ancient Rome's fearsome gladiators?

'S1/E1 - The Making and Breaking'. Biographer Martha Zamora describes Frida's rebellious schooldays, where she falls in with the boys and meets Diego Rivera, a superstar artist who will go on to change her life.