In the Lambeyeque valley in Northern Peru lies a strange lost world - the forgotten ruins of 250 mysterious pyramids, including some of the biggest on the planet.

More than 3,000 years ago a mysterious and ruthless civilization rose from nothing, created a brutal and unstoppable army and built an empire that rivalled Egypt and Babylon.

This episode looks at the legendary lost city of Piramesse. This magnificent ancient capital was built 3,000 years ago by the Egyptian pharaoh Ramesses the Great, but long ago the whole city disappeared.