I read this book back in the late 90s, early 00s when I was in primary school/early high school. This is what I can remember:
- An Archaeologist, down on his luck, stumbles upon a massive open-air sandstone slab or floor near the Great Pyramids
- Everyone speculates what it is, Ancient meeting place or town square, dance floor etc.
- Bad guy takes credit (The bad guy seems to always steal his discoveries - sort of a major hero's foil)
- The hero keeps looking, and discovers a hidden tunnel. Makes it past all the booby traps, and ends up in a massive underground cavern, where the upside-down pyramid is. The 'bottom' (top) of the pyramid in this case is the sandstone 'floor' discovered previously.
I remember the Hero and the side-kick talking about how little difference their weight would make if they scale the sides, but that's about it.
Every search I do just brings up the journalism technique called the 'inverted-pyramid', and books describing the technique.
