<human>:  What is the largest pyramid?
<bot>: The largest pyramid is the Pyramid of Cheops. It is the oldest and largest of the three pyramids in Giza, Egypt. It is believed to have been built for the pharaoh Khufu, also known as Cheops, who ruled Egypt from 2589 to 2566 BC. The pyramid is 481 feet tall, and it is the only one of the three pyramids that is still standing.