Here on Earth, exploration seems kind of, well, over. Sure, there are plenty of places I've never been, but there are few that I can't see from the comfort of my own home via Google Earth. I know it's not the same as being there, but gosh, getting anywhere is expensive.
That said, exploration is actually far from over. And you can always count on the good folks at NASA to not only keeping pushing the boundaries, but to meet some incredible expectations on the way.