408 Europe's Royal Families; Agatha Christie's Grand Tour; Walking Dublin

Just in time for "Bloomsday," a Dublin tour guide takes us on an audio walk past the city's must-see sights for fans of James Joyce's "Ulysses." Then we hear about Agatha Christie's 1922 Grand Tour to promote the British Empire, as told to her grandson. And we take a close look at how World War I upended the roles of Europe's monarchies.