Goodbye to everything we knew about the Great Wall of China: a historic discovery calls into question the way it was built
In 2007, after a public competition, the list of the new seven wonders of the modern world was announced: the Colosseum (Italy), Chichen Itza (Mexico), Christ the Redeemer (Brazil) ...
Archaeology breakthrough as scientists left stunned by 'marvel of engineering'
The discovery shed new light on just how advanced the civilisation that lived in the ancient city of Petra was.