If you're something of a daredevil, and further, if you've ever wondered what it'd be like to climb to the top of the Brooklyn Bridge --- or wander amid the catacombs beneath Paris, or maybe just take an up-close look at a "ghost station" within the far-reaching New York City subway system --- you might be a latent "urban explorer." Our guest on ST is an active explorer of this sort; Moses Gates, who joins us by phone, is also an urban planner, a licensed New York City tour guide, and an assistant professor of demography at the Pratt Institute.