The ancient pyramids at Giza in Egypt are some of the most recognizable architectural feats in the world. The Great Pyramid itself was completed 4,600–4,450 years ago, yet remains largely intact despite spending millennia exposed to not only the harsh desert environment,

Constructed by ancient Egyptians, the Great Pyramid has survived multiple earthquakes through the ages—now researchers think they know why

Roig’s model found that using a single ramp would have been insufficient and would have required nearly half a century of construction to reach the pyramid’s completion.

Pharaohs Khufu, Khafre, and Menkaure built their massive tombs to last. For more than 4,000 years, the Pyramids of Giza continue to amaze while holding on to their many secrets.