The ancient Egyptians didn't have the arch so they used corbelling to create large spaces inside the Pyramids. Only a limited number are allowed in any of the Giza pyramids on any one day and you have to get there first thing to queue but it is well worth it.
The long Gallery is in the Great Pyramid and is some 60 feet long and slopes upward. It has been created by slightly overlapping stones as they go up to create a long-toothed triangular space. It is amazing.
If you haven't the time or patience to queue for tickets, the Red Pyramid at the Dahshur Pyramid has three much smaller corbelled rooms which are truly amazing.
Giza is approximately 20km southwest of Cairo.
Dahshur is approximately 40km south of Cairo.
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