The Great Pyramids are ancient structures located in Giza, Egypt. They were built as tombs for the pharaohs during the Old Kingdom period, around 2580 to 2560 BCE. The most famous of these is the Great Pyramid of Giza, which is the largest and was originally 481 feet tall. Constructed using millions of limestone blocks, the pyramids showcase advanced engineering techniques of their time. They served not only as burial sites but also as symbols of the pharaohs' power and a means to ensure their journey to the afterlife. The pyramids remain one of the most remarkable achievements of ancient civilization.