Alan Yentob journeys through Tolstoy's Russia, examining how the country's great novelist became its great troublemaker, first looking back at his youth.

Alan Yentob follows Tolstoy through the tortured second half of his life as he transformed from aristocrat to anarchist and turned his back on his wife.

Alan Yentob meets clinical neurologist Dr Oliver Sacks. Through fascinating case studies, the film explores how humans see, not just with their eyes, but also with the mind.

Alan Yentob visits Egypt's National Museum, possibly the most precious museum in the world, which stood at the centre of the action during the revolution on Cairo's Tahrir Square.

Alan Yentob introduces Michael Epstein's film uncovering John Lennon and Yoko Ono's move to New York City, as Lennon sought to escape the mayhem of the Beatles era.

Alan Yentob introduces John Scheinfeld's documentary, which tells the story of the riotous life and music of Harry Nilsson, a friend and hero of John Lennon's.

With Iraq having a presence at the Venice Biennale for the first time since Saddam Hussein's rise to power, Imagine follows the chosen artists ahead of the show.