The 1st thing that strikes you about them is their huge, immense enormous size! it must have been a massive undertaking to build these things - I just cannot explain how big these things are. Then, on top of that you think when Julius Ceasar saw these they were already 2000 years old.
The Great Pyramid of Giza was one of the Seven Wonders of the Ancient World - It is the only wonder to survive into modern times.
The Ancient Egyptians covered the faces of pyramids with polished white limestone, containing great quantities of fossilized seashells.
Many of the facing stones have fallen or have been removed and used to build the mosques of Cairo.
The Pyramid was locked and the entrance was hidden. In the 9th Century the 7th Abbasid Caliph, Al-Mamun (Umayyad Dynasty). Got his men to
enter by force at the 7th level of masonry. (The actual entrance is on the 19th course). Having dug or blasted their way through approximately over 30 metres of masonry they broke through.