The Pyramids of Giza were constructed between 2589 and 2504 BC, no one is 100% sure how these pyramids were built, but scientists speculate that ramps were used to transport and move the blocks into place during the construction, but recent research suggests that a small amount of water was placed on the sand in front of them and that made it easier for them to move. This is also how archeologists suspect The Sphinx was built.