The pyramids are mostly solid on the inside, but there are passageways, rooms, and burial chambers, some open to the public, and some yet to be accessed.
Inside the Pyramids of Giza: secrets, facts and curiosities
Inside the Pyramids of Giza: secrets, facts and curiosities
Long-Lost Corridor Inside Great Pyramid Of Giza Revealed By Cosmic
Inside the Pyramids of Giza: secrets, facts and curiosities - Exoticca Blog
Egypt unveils 4,500-year-old tunnel hidden inside Great Pyramid
Archaeologists discover ancient tunnel at Great Pyramid of Giza
What is under the pyramids of Egypt? - Quora
LEGO IDEAS - Giza - Exploring the Great Pyramid
What's inside Egyptian Pyramids?