Past
Lost civilisations
Ancient cities, monuments and machines from civilisations that have ended, and what their remains tell us about how they lived.
Fact files
All topics ›Göbekli Tepe
9,600 to 8,200 BCE
UNESCO's date range for the megalithic structures
The Antikythera mechanism
30 gearwheels
Surviving, across 82 fragments
The Seven Wonders of the Ancient World
1 wonder
Still standing: the Great Pyramid of Giza
The Inca Empire
10 to 12 million
People in the empire, depending on the source
Machu Picchu
2,430 metres
Height above sea level, per UNESCO
Troy
9 cities
Main cities, Troy I to Troy IX, in the standard sequence