Must visit pyramids not only Cheops, Chephren and Menkaure pyramids in Giza, but also the oldest of all pyramids the step one in Saqqara, then Meidum pyramid, then Dahshur bent and red pyramids, On case you want to visit more go to see Lahoon and Hawara in Fayoum oasi, there are also other small pyramids surrounding the step pyramid of Saqqara, and not so far from it there are Abu Seir