Michael Palin visits the Potala Palace and the great monasteries of Tashilunpo and Sera, where the traditional Tibetan towns are being replaced by modern Chinese cities, he then accompanies some pilgrims to the holy Namtso Lake.

David Attenborough explores just how far climate change is altering our planet, from drought-stricken rainforest to declining polar bears, from flooded homes to bleached coral. He searches for the evidence that it is our daily activities which are radically changing the climate, leaving the future of Earth largely up to us.

A team of experts try to recreate astounding feats of engineering. Prof Chris Wise and Dr Caroline Baillie attempt to build a replica of the first submarine.

Using newly-released files, concealed by the KGB in Moscow and held in archives for nearly 50 years, the programme exposes the events behind the planning and building of the Auschwitz concentration camp. Professor Gerald Fleming, a researcher into Nazi war crimes and architect Robert van Pelt, investigate these files and reveal evidence which shows how German civilian engineers and Bauhaus-trained architects deliberately colluded with the SS to plan the genocide.

The legend of King Arthur and the Knights of the Round Table is explored, with stops in Ireland, Scotland and Wales.

As the highest water bills ever land on doormats across the UK this April, this film investigates the future of the world's water, and paints a disturbing picture of a world running out of the most basic of life's essentials.

One of two contrasting views on immigration under the slot title 'Unwelcome Britain?'. The other is 'Let 'em all in' Looks at the impact of immigration on social and health services, the economy and British cultural identity. Rod Liddle, takes a critical look at current immigration policy and raises concerns about problems that need addressing in order to prevent growing resentment and anger from many people in the country.

In 1992 the nuclear industry celebrated its 50th anniversary and the report on the accident at Chernobyl claimed there was no evidence of long term health effects. Within months, a team of western scientists presented a very different picture with evidence of an epidemic of thyroid cancers in local children.