Great Pyramid likely built with internal ramp
All of the theories about how the Great Pyramid was built had problems with them. Until Jean-Pierre Houdin, a French architect, came up with his internal ramp theory. He suggests that blocks were hauled up a ramp that was — and still is — inside the pyramid. It makes perfect sense, and it’s also consistent with an image of the inside of the pyramid taken by a French team using microgravimetry. Here’s an article by Bob Brier on Archaeology:
Oddly, in the past 11 years the Egyptian authorities haven’t allowed any further investigation within the pyramid to confirm this theory.