David Steele/Alamy
How long will it be until the pyramids in Egypt weather away completely?
Mark Thompson
Tewkesbury, Gloucestershire, UK
The Great Pyramid of Giza, built on the orders of Khufu (Cheops) in 2540 BC, is the numero uno of pyramids, with superior materials, engineering and design know-how to any built before. Ancient Greek tourists would travel thousands of miles to stare at its towering limestone steps.
Cleopatra lived closer in history to the construction of today’s tallest building – the Burj Khalifa – than she did to that of the Great Pyramid. When the last mammoths died out, it was already…
