You might also be interested in....

Submit your images to the Earth Photo competition

We are excited to announce a new photography competition, Earth Photo, in partnership with the Forestry Commission England.

The Aztec city Tenochtitlán was the largest and best-run on Earth. In Mexico John discovered that Hernán Cortés conquered not by guns and horses, but language, diplomacy, obsidian and a little steel.

Bob explores the significance of the archaeology in the Middle East and North Africa, the current threats and pressures it faces, and the work to document and preserve sites at risk.