You don't think cell phones and the Internet are marvels? Anywhere in the developed world, you can pick up a little box and talk to your mother, who could be anywhere else in the developed world. I think that's pretty great.
Anyway, mass production of antimatter comes to mind. And there are a lot of things which we know are possible but I will still be amazed if we ever accomplish, like ending our reliance on fossil fuels or a permanent settlement on the moon.