Also we didn’t forget about the pyramids. What does that even mean? People have lived right next to them since they were built.
There are more pyramids than just the 3 of Giza in Egypt… During the last 100 years, multiple pyramids (probably 100s) have been found that were forgotten by humanity. There are discoveries in China, Peru, Egypt, …
The pyramids weren’t buried 1km under the surface
Somehow ironic. Yes, the Tomb of Tutankhamun was not buried 1km under the surface. But it was discovered 3.250 years after it was build in 1922.
Anyway… There is Egyptology, which has the goal to find out what they have done 1000s of years ago, because we did/do not know that. We don’t know who some of the pharaohs are, some pharaohs that are mentioned haven’t even been found. He can read some of the writings, we can’t read all of them. Lots of knowledge was lost, and that’s what you need to realized when you are planning to store stuff for 1000s of years.