The Pyramid of Khafre
The pyramid of Khafre or of Chephren is the middle of the three Ancient Egyptian Pyramids of Giza, the second tallest and second largest of the group. It is the only pyramid out of the three that still has cladding at the top. It is only slightly smaller than the Great Pyramid but gets much less attention.

While mainstream Egyptologists claim that it was the tomb of the Pharoh Khafre there is no evidence that it was a tomb, as with all of the other Egyptian pyramids. My guess it that it was built circa the same time as the other Giza Pyramids. There is speculation that they were built many thousands of years earlier than the reign of the Pharaohs and could have been power plants. I have no idea, but they are amazing, and despite their age, they are far superior to any constructed later. Like the Great Pyramid, the interior does not contain any hieroglyphs or colorful images like the tombs in the Valley of the Kings near Luxor.