Preview | Hidden in the Amazon

Recent discoveries and technological advances are shedding new light on our understanding of pre-Columbian societies in the Amazon. Scientists speculate the rainforest was home to between 8 and 10 million people living in large, well-established communities.

A review of how ancient Egyptian hieroglyphics were first translated 200 years ago, and a look at the archaeological work now being done in Egypt to understand one of the empire’s most important scribes.

Is history repeating Itself? Follow an in-depth investigation into the real causes of the decline of the Roman Empire. Three deadly epidemics and climate change could have caused its collapse — drawing frightening parallels to today.