It has long been puzzling archaeologists how ancient Egyptians managed to achieve the near-perfectly aligned Giza pyramids. The great pyramid is made of 2.3 million stones, weighing up to 200 tons each and covering 13 acres.

There is still debate about how ancient workers lifted these blocks from ground level to the top of the pyramids given that the tallest pyramid at Giza was 481 feet (146.5 meters) high. However, archaeologists have now uncovered the remnants of a ramp made of limestone chips, gypsum and clay near the Giza pyramids that would very likely have been used to access the upper levels of the pyramids.

People unable to believe that ancient Egyptians engineered such massive structures as the pyramids usually gravitate to another explanation – aliens being one. A number of “aliens built the pyramids” claims are popular among many conspiracy theorists.