![Tourists enter the step pyramid of Djoser at the Saqqara necropolis, south of Cairo. AFP](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/KNJGSBQXQBG5RNL2PDJISUPZ7A.jpg?focal=2731%2C27&auth=d272394330d7186a72cecaf63189fc1927b193bb52a760cf3b5af39d73db6ca3&width=400&height=225)
Tourists enter the step pyramid of Djoser at the Saqqara necropolis, south of Cairo. AFP
Tourists enter the step pyramid of Djoser at the Saqqara necropolis, south of Cairo. AFP
Egypt's oldest pyramid may have been built using hydraulic lift
Researchers say a hydraulic lift system allowed water from a dam to flow into two shafts, enabling workers to raise and lower a float carrying stones