“Where are all the people?” a friend asks upon seeing my photos from a recent trip to China, where I hiked on the Great Wall (and I have a T-shirt to prove it, so there). Truth is, I had wondered that ...

JINSHANLING, China — The Mongol attackers are long gone, but the vast brick-and-stone barrier that helped China repel them and other invaders still stands — and awaits a new horde of travelers who can ...