PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Pyramids of Giza, Egypt, at sunset. These pyramids were built around 4500 years ago as tombs for Egyptian pharaohs. The significance of their shape is unclear, although some think pyramids might have represented the Sun's rays and offered a ramp to facilitate the pharaoh's entry into the celestial realm. The necropolis is located on the Giza plateau, near Cairo.
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