Answer: Egypt
Notes: The Great Pyramid of Giza, the tomb of Pharaoh Khufu, is the largest pyramid in Egypt and the oldest of the Seven Wonders of the Ancient World. Built over a period of approximately 27 years in the early 26th century BC, it is located in the Pyramid Fields of Giza, Egypt. Scientists have discovered a hidden passage inside the Great Pyramid of Giza, as part of the ScanPyramids project. This passage is 9 meters in length and more than 2 meters in width.
