Roman ruins can be found in a huge geographical area. At its peak, the Roman Empire spanned Europe and parts of Northern Africa and the Middle East. That means Roman ruins can be found in a huge geographical area. Historian Boris Dreyer explores the ruins of an amphitheatre in Austria to understand what it says about Rome and its empire at the time. Watch Colosseum: Rise & Fall on Sundays at 8pm on National Geographic UK. | National Geographic UK