Here’s where it gets mind-blowing: the blocks were placed with a precision of 0.5 millimeters in some joints—so tight that you can’t slide a credit card between them. They didn’t use mortar in all cases; instead, they relied on the sheer weight and perfect fit of the stones.
To achieve this, workers used water-filled trenches and leveling rods to check that each layer was perfectly horizontal. They also used a plumb bob to ensure vertical accuracy. No lasers, no GPS, just focused craftsmanship and years of practice.
Fun fact: the Great Pyramid of Giza is aligned to true north with an error of less than 0.06 degrees. That’s more accurate than the Meridian Building at the Greenwich Observatory, built thousands of years later.
