A couple of years ago I spent a week or so in northern Vietnam. One of the most fascinating things I did was spend two nights on a boat tooling around Hao Long Bay. It was almost winter time, so there was a lot of fog in the air that made the whole experience feel a little mysterious and surreal. We’d be slowly crawling along and all of the sudden these huge rock formations would just appear, rising up out of the water in the middle of the bay.