The pyramid of Khufu.

about 4500 years

The Great Pyramid of Giza or Pyramid of Khufu is world's largest pyramid. It is located in the famous Pyramid complex of Giza, Egypt. It had an original height of 146.5 meters which has now reduced to 138.8 meters. Its base is 230.4 meters wide.

The Giza Necropolis is on the Giza Plateau, on the outskirts of Cairo, Egypt. It is located about 5 miles inland from the Nile River and Giza is about 15 miles south-west of Cairo. It is a complex of ancient monuments includes three pyramids known as the Great Pyramids, these are -- The pyramid of Khufu also known as the Great Pyramid of Giza or the Pyramid of Cheops, the pyramid of Khafre and pyramid of Menkaure. It also includes The Great Sphinx.

Because it is the largest pyramid on the Giza plateau.
the name giza was given to it because it is a pyramid and it is in the city of giza