I like to joke that the only time I ever left the USA, it was only to get a better view OF the USA. (Crossed over to Canada to view the American Niagara Falls.) Got back as soon as I could.
There aren't many places outside the USA I'd want to go. You can have the British Isles, all of Asia, South America. I wouldn't mind going to Italy someday. Then again, if my current work aspirations pan out, I may end up travelling the world. But I figure if it's for work it's worth it. But for fun? I like it here in the USA.
I did a couple of trips to Australia when I was younger.
Right now, with the state of the world, even if I had the money to fly myself and my kiddies around the world, I would "See the USA in my Chevrolet"
There is so much to see and do here, I don't think we would ever run out.