Check out Lydia Netzer's awesome New York Times op-ed, "The Man in the Moon":
Except for the one that involved landing on the Moon. When a human went and stood on the Moon and looked back at the Earth, that was a different kind of breakthrough. Nothing tangible changed when Neil Armstrong’s foot dug into the lunar dust and his eyes turned back at us. We didn’t get faster wheels or smaller machines or more effective medicine. But we changed, fundamentally. What had been unknown, was known. What had been unseen was seen. And our human horizon popped out 200,000 miles. Forever, we would see the Earth differently, because we had seen it from someplace truly foreign.[READ]