Egypt’s Great Pyramid of Giza one of the world’s wonders visited by millions of tourists yearly contains a hidden void of about 30 metres/100 feet long, according to recent scientific discoveries. More in the video link below and here https://news.nationalgeographic.com/2017/11/great-pyramid-giza-void-discovered-khufu-archaeology-science/
https://www.facebook.com/ajplusenglish/videos/1076944899113683/