MrBeast and his team were granted unrestricted access to the Great Pyramids of Egypt for 100 hours. They explored various chambers within the pyramids, including what is believed to be King Khufu's tomb and King Khafre's burial chamber. They also ventured into the Tomb of God Osiris, deep underground, and even climbed to the highest point inside the Great Pyramid, a feat rarely accomplished by modern humans.Throughout their adventure, they sought to uncover the truth about who built the pyramids, visiting the workman's tomb where evidence of manual labor was found on ancient skeletons. They also explored the Sphinx for hidden secrets and treasures. The video concludes with the team discovering ancient graffiti within the pyramid that further supports the theory that ancient Egyptians, not aliens, built these magnificent structures as tombs for their pharaohs.