Where can I watch Mary Beard's Ultimate Rome: Empire Without Limit in United States?

In this four-part series classicist and historian, Professor Mary Beard draws on her immense scholarship, unique viewpoints and myth-busting approach to Roman history, to give her definitive take on the Roman Empire. How and why did it happen? In search of answers, she takes us to the most telling sites and the most revealing artifacts, and she examines the legacy the Roman Empire has left behind.