Ancient China from Above

Dr Allan Maca explores the legendary lost city of Xanadu in Inner Mongolia. Today very little remains of Kublai Khan's grand capital - a place that famous explorer, Marco Polo, described as one of the Marvels of the World. But now, with the help of satellite imagery and cutting-edge technology, we can finally uncover Xanadu's secrets, and bring this fabled city and its lavish palaces back to life.

In this episode, Dr. Allan Maca investigates the biggest man-made structure on Earth: the Great Wall of China. This ancient monument has been studied by experts for decades, but it's only now, thanks to new satellite imagery and cutting-edge technology, that its secrets are finally being revealed.