It's been over 1,500 years since the collapse of the Roman empire, but our fascination with this creative, scientific and often barbaric society shows no signs of dimming with the passage of time. And no wonder: at its peak the empire covered nearly two million square miles, spanning large swathes of Europe, Africa and even parts of Asia. There's lots to see, so here we share fascinating photos of ancient marvels to help you step back in time.