As President Trump takes office, Christian Fraser in London and Michelle Fleury in Washington report on the events that are shaping our world.

Martha Kearney retraces the footsteps of 19th-century artist George Victor Du Noyer. Martha examines the movement of power bases from Newgrange to the sumptuous Castletown House. Show more

Drama documentary series. Dan Snow explores the political intrigues and family betrayals between Vikings, Anglo-Saxons and Normans that led to war and the Battle of Hastings. Show more

Professor Jim Al-Khalili investigates the amazing science of gravity. As well sculpting our universe, gravity also affects our weight, height and even the rate at which we age. Show more

Dallas Campbell, Professor Danielle George and Dr Hugh Hunt attempt to restage the very first official broadcast on British television, exactly 80 years after it made history. Show more

Alan Johnson MP tells the story of 500 years of the Royal Mail. As a former postman, Alan brings his unique personal perspective to this fascinating slice of social history. Show more

Physicist Dr Helen Czerski takes us on a journey into the science of bubbles - not just fun toys, but also powerful tools that push back the boundaries of science. Show more

Professor Jim Al-Khalili investigates the amazing science of gravity. As well sculpting our universe, gravity also affects our weight, height and even the rate at which we age. Show more