The Emperor's Lost Harbour

It's the most extraordinary feat of engineering in history, and one of the most iconic man-made structures on the planet - the Great Wall of China, stretching thousands of miles across barren deserts and treacherous mountains before finally plunging into the sea. But why did the Chinese go to such staggering lengths to build it, and what are the secrets that have enabled it to survive for over 2,000 years? Now, ground breaking science is re-writing its complex history and de-coding its mysteries to reveal that there is much more to the Great Wall than just bricks and mortar. Cutting edge chemistry reveals that the secret to the Great Wall's remarkable strength is a simple ingredient found in every kitchen, and a new survey also determines that its length is truly amazing, as we finally solve the enigma at the heart of the world's greatest mega-structure.

Protesters diary from Gezi Park - Taksim Square, Istanbul. Occupy Gezi movement started when the government decided to build shopping mall in place of the last green area that remained in the middle of Taksim Square.

This documentary follows a team of local archaeologists excavating never before explored passageways, shafts, and tombs, piecing together the secrets of Egypt’s most significant find in almost 50 years in Saqqara.

To outsiders, Turkmenistan is one of the world's least known countries. For the first time in ten years, a film crew has been free to visit spectacular excavation sites and follow international researchers into areas that have long been off-limits. Once considered the poorest part of the Soviet Union, oil and natural gas have brought new wealth to Turkmenistan today. A little known fact in the West is that 4,000 years ago, the country was home to one of the ancient world's centers of power. Although it flourished around the same time as the advanced civilizations of Mesopotamia and Egypt, the Margiana empire was later largely forgotten. Since the fall of the Soviet Union, the country has been slowly opening up to international researchers, and its astounding cultural heritage is coming to light.

Thousands of terracotta warriors guarded the first Chinese emperor's tomb. This is their story, told through archeological evidence and reenactments.

In Morocco, new excavations on the site of Jebel Irhoud upset the generally accepted view of the dating of the appearance of man.