Of course you couldn't go to China without seeing the Great Wall. Most people who visit China see one of the sections of the Wall near Beijing. But the section I want to see is near Jiayuguan, the westernmost part of the Great Wall.
There are two interesting things here. First, the Jiayuguan Pass with two gates. Most people think of the Great Wall as one long wall strung out across China, but it's also gates in passes and crumbling sections. There's also the Overhanging Great Wall which provides at least as nice a site as any of the areas near Beijing.
But the Jiayuguan airport is only open from April to October. The nearest year-round airport is a 7-hour bus ride away. Since we're planning this trip with two little children, I'm not particularly interested in a 7-hour bus ride.
So we'll be seeing the Wall near Beijing. But I'll be thinking about Jiayuguan while we're there.