1. The pyramids at Giza.
This may sound obvious but visiting them is not the only option. You can go inside them, ride camels around them and possibly most spectacular of them all, visit them and night and view the awesome Sound and Light Show at the pyramids. In the darkness of night, the Sphinx is lit up and narrates the history of the Pyramids. In addition a fantastic soundtrack plays and lasers dance all over the Pyramids. This show is a MUST.