Multimedia

PHOTO GALLERY: What mysteries might still be hidden under Egypt's pyramids?




Egyptian Antiquities Minister, Khaled El-Anani, left, and Zahi Hawass, Egypt's former head of antiquities, second left, listen to French expert Sebastien Procureur in front of a muon detector machine in front of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Dutch tourists visit the inside of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Indonesian visit the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Tourists pose for pictures at the entrance of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Egyptian Antiquities Minister, Khaled El-Anani, left, and Zahi Hawass, Egypt's former head of antiquities, second left, listen to French expert Sebastien Procureur in front of a muon detector machine at a tent in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)

French expert Sebastien Procureur, right, talks to Egyptian Antiquities Minister, Khaled El-Anani, fourth right, and Zahi Hawass, Egypt's former head of antiquities, second right, in front of a muon detector machine at a tent in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016 (AP)