I've been to New Grange and Stonehenge. While it's pretty neat to go there, it's just a structure. The real value and interest for me is reading up on what the researchers have found out. Let the plinths for Stonehendge were quarried 150 miles away in what is now Wales.
Just think about that, mind blowing.
Full disclosure because interesting: He claimed to have returned a couple of days later, preparing by filling his backpack full of stones as a defense mechanism, and killed one of them when they attempted to attack him again. I didn't doubt the story, because he really had no reason to impress anyone, didn't seem the type, seemed genuinely shaken by the memory, and the subject of Egypt came up tangentially.
We lucked out. Our driver turned out to be a Coptic Christian, and he had much to say about (what was then) the recent Arab Spring from a different angle.
You haven't been in front of it, right? Not being there once, needing to spend your time and energy, standing there and thinking how old it is, seeing how big it is, makes easier to say something like that.
I just get more out of the research and you don't have to visit to get that.