I was totally on the same wavelength with Karl Pilkington in An Idiot Abroad when he discovered they were right next to the city. It's such a weird censoring -- would people value them less if they knew how close they were to development?
For reference here[1] is a traditional shot of the pyramids, and here[2] is an aerial view of the adjoining urban area.
[1] - https://commons.wikimedia.org/wiki/File:All_Gizah_Pyramids.j...
[2] - https://commons.wikimedia.org/wiki/File:Giza-pyramids.JPG