BLDGBLOG (who lives in my neighborhood now! Yes!) on underground cities. As always the key thing is that he writes about this stuff with such glee:
Today’s city planners need to read more things like this! How exciting would it be if you could visit your grandparents in some small town somewhere, only to find that a door in the basement, which you thought led to a closet… actually opens up onto an underground Home Depot? Or a chapel. Or their neighbor’s house.
Via Design Observer, which is so worth subscribing to.