The Great Pyramid of Giza is the oldest and largest of three pyramids in the Giza Necropolis located in modern Cairo, Egypt. It is also known as the Pyramid of Khufu. It is the oldest of all Seven Ancient Wonders of the World. For over 3800 years, it was the tallest man-made structure in the world. It is 146 metres above the ground. This pyramid is the only one in Egypt to have passages inside that go up and go down.