We were all -- me and the 12-year-old niblings -- impressed with the cleanliness and efficiency of the underground walkways and buildings. "This is nothing like New York, it's clean," they repeated several times. It's truly a terrific idea in a city that can get blisteringly cold. Even though we were here at summer's end, we really enjoyed the uniqueness of subterranean shopping, and even the pre-teens could appreciate the practicality. I only wish the entrances were better marked, since it seems we passed several before finally figuring out how to get in.