Even on days with normal Cairene pollution can you see the pyramids at Giza. And large parts of Cairo.
The Citadel is visible from almost everywhere in Cairo, lying over the city as a promise of adventures and medieval stories. When actually getting here, it can be quite disappointing, as its structures are crude, simple and perhaps in a little bit too good condition. But there is one more attraction, and you will most likely have figured this out beforehand: the panoramic view. From the Citadel you can get a feel of how large, yet how little (you understand??) Cairo is. Distances that can take half an hour to cover, now seem impolitely close. Yet, as far as your eye can see, this city continues. Except behind the pyramids, where the sea of sands appear almost like a fata morgana.