The Secret War On Terror reveals the astonishing inside story of the intelligence war which has been fought against al-Qaeda over the last decade since 9/11.

Leading structural engineer and designer Cecil Balmond goes beyond the well known histories of three celebrated monuments: Stonehenge, the Taj Mahal and the Great Pyramid, to reveal the hidden geometry at their cores.

Events in Libya have reached a dramatic conclusion.

On the Berlin Wall's 50th anniversary, Gerry Northam looks at its political context and its human consequences.

Warning: This documentary contains conversations about sexual experience. Disabled people are rarely touched in a loving way or thought of as sexually desirable yet they have the same need for a sex life as everyone else. John Blades, who has a major disability himself, takes a look at the importance of touch to every human being.

Linda Pressly follows the migrants heading north through Guatemala into Mexico – despite the dangers of kidnap by the notorious Zetas gang.

On the Berlin Wall's 50th anniversary, Gerry Northam looks at its political context and its human consequences.

Can a young Canadian man with Down's Syndrome get a university degree? Alisa Siegal follows the story of Ashif Jaffer who wants to fulfil his dream for a university education and the degree that goes with it.

Have you bought a diamond recently? Would you really know where it came from? Assignment goes into Zimbabwe's Marange diamond fields and uncovers evidence of torture camps and wide-scale killings.

BBC Security correspondent Gordon Corera tells the untold tale of how the Americans hunted their most wanted man - from the caves of Tora Bora in Afghanistan through to his stronghold in the Pakistani city of Abbottabad.