The Great was built by the Egyptian king Khufu,he wanted to construct a grand monument that would honor him after he died. What he had built was perhaps the biggest structure on the planet.
Archaeologist, Zahi Hawass wanted to restore the Great Pyramid and the smaller ones around it,he set this as his life's goal.
Hawass fixed the problems, by Closing the pyramid, which allowed workers to seal the cracks ,scrape off mold, and install airways that allow harmful moisture to escape. The work has done quickly to allow tourists to return.