But what impresses visitors a lot is PATH.PATH is Toronto's underground walkway,and it is the largest underground shopping complex in the world.It runs for 27 kilometers and connect 1,200 shops and other businesses. There, visitors and residents can go shopping for many things, make a photocopy, have a haircut, catch a movie,or find a subway stop.It is especially convenient in winter when the temperatures are many degrees below zero and when there is snow.