explain on Instagram: "The pyramids' construction is still somewhat of a mystery, but historians and archaeologists believe they were built using a combination of ramps, pulleys, and levers. Here's a brief rundown: The ancient Egyptians quarried limestone and granite blocks, some weighing as much as 2.5 tons, and moved them using ramps and wooden sleds. They built the pyramid in layers, with the smooth limestone outer casing added last. It took around 20 years to build the Great Pyramid of Giza,