When you get into Missouri and Arkansas, you are entering cave country. And the tourist signs prove it, believe me. You could spend an entire vacation just touring caverns, using your imagination to see how that stalagmite looks like Snoopy or an Indian chief. As we were roaring down the Interstate one chilly day, we saw this sign that said, "Fantastic Caverns - a warm 60 degrees." In winter, 60 sounds pretty warm, I guess. What do you bet they change the sign in the summer. "Fantastic Caverns - a cool 60 degrees." And in summer, 60 degrees sounds pretty cool. Interesting - the seasons change; the cave never does.