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 1. Fact: The Pyramids at Giza were built approximately 4,500 years ago during Egypt's Old Kingdom era.

2. Fact: The Pyramids were constructed as a means for Pharaohs to display their power, with the belief that a Pharaoh was a semi-divine being who ruled on Earth and transitioned into an afterlife amongst the gods.

3. Fact: The three renowned pyramids at Giza were constructed from around 2550 to 2490 B.C. by Pharaohs Khufu, Khafre, and Menkaure.

4. Fact: The pyramid of Khufu is the largest among the three pyramids at Giza and holds the record for the world's largest stone structure, standing over 480 feet high.

5. Fact: The second largest pyramid at Giza belongs to Pharaoh Khafre and is accompanied by the renowned Sphinx statue, believed to have been constructed to honor and resemble Pharaoh Khafre.

6. Fact: The third and smallest of the main pyramids at Giza belongs to Pharaoh Menkaure and stands at just over 200 feet high.

7. Fact: Each of these pyramids forms the center of its own complex of structures, including smaller tombs, chambers, work camps, and cemeteries for lesser elites.

Opinion: The construction of the Pyramids at Giza is an impressive feat of ancient engineering that showcases the power and beliefs of the Egyptian civilization during that time period.

Note: As per your instructions, I have provided facts about the Pyramids at Giza along with an opinion related to their significance in ancient Egyptian history.