Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower . Some of ancient Egypt's crowning achievements, the Giza pyramids and Great Sphinx, were constructed during the Old Kingdom. Under the Roman and Byzantine Egypt : 30 BC– AD. The Great Pyramid of Giza is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt. It is the oldest of the Constructed : c. – BC ( 4th dynasty ). The most famous pyramids are the Egyptian pyramids — huge structures built of brick or stone, some of which are among the world's Ancient monuments · Mesopotamia · Greece · Mesoamerica.