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The pyramid was likely opened and robbed during the First Intermediate Period. During the 18th dynasty the overseer of temple construction robbed casing stone from it to build a temple in Heliopolis on Ramesses II's orders. Arab historian Ibn Abd as-Salaam recorded that the pyramid was opened in 1372. It was first explored in modern time by Giovanni Belzoni on 2 March 1818 and the first complete exploration was conducted by John Perring in 1837.
Construction
Like the Great Pyramid built by Khafre's father Khufu, a rock outcropping was used in the core. Due to the slope of the plateau, the northwest corner was cut 10 m (33 ft) out of the rock subsoil and the southeast corner is built up.
The pyramid is built of horizontal courses. The stones used at the bottom are very large, but as the pyramid rises, the stones become smaller, becoming only 50 cm (20 in) thick at the apex. The courses are rough and irregular for the first half of its height but a narrow band of regular masonry is clear in the midsection of the pyramid. Casing stones cover the top third of the pyramid, but the pyramidion and part of the apex are missing.
The bottom course of casing stones was made out of pink granite but the remainder of the pyramid was cased in Torah Limestone. Close examination reveals that the corner edges of remaining casing stones are not completely straight, but are staggered by a few millimeters. One theory is that this is due to settling from seismic activity. An alternative theory postulates that the slope on the blocks cut to shape before being placed due to the limited working space towards the top of the pyramid.
Inside the Pyramid
Two entrances lead to the burial chamber, one that opens 11.54 m (38 ft) up the face of the pyramid and one that opens at the base of the pyramid. These passageways do not align with the centerline of the pyramid, but are offset to the east by 12 m (39 ft). The lower descending passageway is carved completely out of the bedrock, descending, running horizontal, then ascending to join the horizontal passage leading to the burial chamber.
One theory as to why there are two entrances is that the pyramid was intended to be much larger with the northern base shifted 30 m (98 ft) further to the north which would make the Khafre's pyramid much larger than his father's pyramid. This would place the entrance to lower descending passage within the masonry of the pyramid. While the bedrock is cut away farther from the pyramid on the north side than on the west side, it is not clear that there is enough room on the plateau for the enclosure wall and pyramid terrace. An alternative theory is that, as with many earlier pyramids, plans were changed and the entrance was moved midway through construction.
There is a subsidiary chamber that opens to the west of the lower passage the purpose of which is uncertain. It may be used to store offerings, store burial equipment, or it may be a serdab chamber. The upper descending passage is clad in granite and descends to join with the horizontal passage to the burial chamber.
The burial chamber was carved out of a pit in the bedrock. The roof is constructed of gabled limestone beams. The chamber is rectangular, 14.15 m by 5 m (46.4 ft x 16 ft), and is oriented east-west. Khafre's sarcophagus was carved out of a solid block of granite and sunk partially in the floor. Another pit in the floor likely contained the canopic chest.
From Wikipedia
http://en.wikipedia.org/wiki/Khafre%27s_Pyramid
Text is available under the terms of the GNU Free Documentation
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