I have been to car graveyard, found the key in the seat of Sten's car, can't find my way to the pyramid. If anyone can help please do. I have back tracked, re read the walthrough, and seem to be at a stand still.

Have you triggered the pyramid already?
Is it in the map already?
If not - At upper floor of Malte's museum - have you looked around and learned about the pyramid and did you read the book about the pyramid close to the entryway.

Is that the main entryway or entryway to top floor of museum. If its lower floor entryway I can't find it.

Top floor I think - close to doorway.