Katty Kay in Washington and Christian Fraser in London report on the events that are shaping the world.

A look at how the Royal Scots Dragoon Guards, now a modern tank force, is still shaped and inspired by the daring charges of its cavalry past. Show more

Huw Edwards presents the history of Wales. He recounts how the lust for power and land by some medieval kings forged Wales into a nation. Show more

Dan Cruickshank reveals the extraordinary story behind the design of iconic WWI memorials and explores the idea behind the creation of the Commonwealth War Graves Commission. Show more

Comedy drama. Rosie is incredibly excited - Gandalf is coming because there's going to be a birthday with lots of presents! It doesn't matter to Rosie that it's Ben's birthday. Show more

An account of the men and horses of the Australian Light Horse and the role they played in World War I at the battles of Romani and Beersheba, and the capture of Damascus in 1918. Show more

Dr Bendor Grosvenor and Emma Dabiri travel to Glasgow to investigate the mystery behind a long-lost picture of one of the most famous gay men in history. Show more

Dr Jago Cooper explores the forgotten people of ancient Costa Rica, who built a series of spectacular settlements amongst the rivers and volcanoes. Show more

When did ordinary TV quiz contestants turn into the pro-quizzers of today? Giving the answers are Victoria Coren Mitchell, Judith Keppel, Chris Tarrant, Mark Labbett and others. Show more

Dan Cruickshank reveals the extraordinary story behind the design of iconic WWI memorials and explores the idea behind the creation of the Commonwealth War Graves Commission. Show more