Visit the Pyramids of Giza
I don't think this needs an explanation, but in case you have no clue, this is the oldest of the seven wonders of the world, and the only monument still fully intact. Well, minus the broken tip of the largest pyramid, but that's a story left for the tour guide. (Tip: you'll find yourself bombarded with people trying to show you around…not all of them are legit. You're better off going at it alone or with a pre-arranged tour guide).