When I was little, I learned a lot of geography from this song. "Mom, what do they mean by gulf-stream waters?" "What's a New York Island?" (I'd seen redwood forests, that much was easy.) I didn't know, nor did many people, that there are a full six verses, until I'd grown up.
Now, it's my all-time favorite patriotic song, and one of my favorite songs all together. There's an illustrated version for all six verses, I've given it to friends of all ages. But seeing Pete Seeger sing it, at nearly 90 years old, sent the tears pouring down my face.