The Great Pyramid is the only survivor of the 7 Wonders of the Ancient World. Its huge and covers an area of 13 acres (52 609 m2)  and 30 Empire State Buildings could be built with the estimated 2,3 million stones. A wall 6 feet (180 cm) high and 1 feet (30 cm) thick could be built from New York to Los Angeles using the amount of stones. This give you an idea of how massive the great pyramid really is and how astonishing the performance is to build such an epic building 5000 years ago.  Until the construction of the Eiffel Tower in 1889, the Great Pyramid was the tallest structure in the world!
Many scientists are still woundering how ancient Egyptians were able to build the pyramids with the primitive technology they had. To this date no one has a good explanation of how it was build. Just this fact alone that we today cant even figure out how it was made makes it a huge mystery what ever angle you want to take. This is the best documantary that i have ever watched about the pyramids. It shows how much more there is to know if you are willing to go outside the mainstream narrative. Enjoy!