Some are being kept "secret" because it would change history. By proving that it wasn't only in Egypt and that pyramids wear built all around the world. So the question becomes how did the builders move over continents and oceans all that time ago? Specially knowing the fact that it already took years to build only one...
Also, a few found outside of Egypt have been dated to be even older than the known pyramids.
It's funny how ppl find it hard to admit new findings to be more plausable, instead they bury them with ridicule and nonesense, just to hold up their names in history.
Ppl need to realize, with time they must evolve, evolution = change. If humanity doesn't grasp this, they're probably doomed.
I've seen many other pictures, then the one you posted above.