Look , George , There's the Great Wall .   I see . It's on top of the hills .   Yeah , it stretches over for thousands of miles .   I know . It's a major symbol of China .   Where can we climb it ?   Do we have any choices ?   Well , we could take the cable car .   Ah ... let's just climb . It's more fun , I think .   Okay . Let's go .   Well , that was tough .   But we made it .   This looks great . When was it built ?   It was first built about twenty-five hundred years ago . 