This was my first trip to Hong Kong and the three dimensionality of central Hong Kong is quite striking with many tall buildings built on various points on a hill and in some cases seemingly on top of other buildings. To get from my hotel to the conference at Hong Kong University, I took a series of outdoor escalators, crossed a bridge and then an elevator followed by some stairs. You need to keep track of elevation to get around that city.
I had never been to China. Did this trip to Hong Kong count? Technically yes, since 1997 Hong Kong is officially a Special Administrative Region of China and shares much of the culture and cuisine of China. But a different currency, visa requirements and economic structure makes it seem like a separate country. Someday I will get to mainland China and make this point moot.