Which of the Seven Wonders of the Ancient World is the only one to remain intact?

Explanation

The Pyramid of Cheops in Giza was built as a tomb for Pharaoh Cheops and is the largest of the three pyramids. It was built during the fourth Egyptian dynasty around 2560 BC and is the oldest, and the only one to remain intact, of the Seven Wonders of the Ancient World. It is believed it was constructed over 20-30 years and originally had a white, smooth surface. The pyramids were not built by slaves but by deeply religious people in order to honour their god.