Okay, so really there are 5 types of tombs. There is the burial mound, which is someone buried in a lot of sand with their most valuable possessions. There are advanced burial mounds, which are burial mounds dug deeper, with rocks on top of them, with people buried in wooden coffins. There are mastabas, which are giant stone slabs that go over a person's tomb. Then, there are the first pyramids, in which people are buried in sarcophagi. Mastaba
Then, finally, there are the good really old pyramids we see today in which Pharaohs were buried for centuries many thousands of years ago. Don't you think we see the pyramids kinda alot? I mean, we see them in postcards, and National Geographic, and the freaking Discovery Channel, and the stinking History Channel and- Well, you get the point.