pyramid of amenemhat iii, the black pyramid built by amenemhat the 3rd at dahshur, named black pyramid for its dark, decaying

3rd africa amenemhat ancient antique appearance bat bent black brick built burial cairo cheops core dahshur dark decaying desert egypt egyptian giza heritage history iii khafree khufu kingdom limestome monument mortuary mound mud named necropolis north old passage pharaoh pyramid pyramids red reddish retro rock rubble ruin rusty sand sinfro sneferu stone superstructure temple tomb tourism travel tura unesco vault vintage world