 
            
            Photoessay: Seoul’s Moving Metal Staircases
              Anyone who has ever played Super Mario Brothers knows that taking any one of the many secret ‘pipelines’ is usually a double-edged sword. On the one hand, you find yourself in a brand new subterranean eco-system, filled with potential riches and the promise of advancing a great distance toward your ultimate goal of completing the...
            
          
 
                 
                 
                 
                 
                 
                 
                