I have some shaky super 8 footage of myself as a six-year old clambering up the last remaining Ancient Wonder of the World, but since the 1980's the Egyptian authorities have put a stop to it. It isn't just about thousands of sweaty, climbing tourists damaging the Pyramids -- it's also downright dangerous. The Pyramids used to be covered in limestone, which has eroded over the years. The steps were never made for climbing. They're uneven, crumbling and quite large -- at least five feet high in some places.
Inevitably, the fact that climbing the pyramids is forbidden doesn't stop everyone from doing it. Young Japanese tourists are apparently particularly adept at avoiding guards and clambering up in the dead of night. Bribing guards to turn a blind eye is also commonplace. But if you think you're going to enjoy the climb and the view, you may be disappointed. Bribing guards and climbing a steep, crumbling, ancient wonder in the pitch dark is not relaxing. Given the air pollution in Cairo, the sunrise views from the top aren't anything to write home about. And going down is even more dangerous than climbing up.
The bottom line is that it's not worth the risk of a fine, arrest or a broken neck. And why not respect the Pyramids instead of satisfying your need to conquer them? If that's not possible then there are plenty of pyramids in Central America you can still climb.
Image of the Great Pyramid of Khafre at Giza by David Hutchinson