[Answer] Where is the world's largest underground walkway?

Step 1 : Introduction to the question "Where is the world's largest underground walkway?"

...1. Toronto 2. Shanghai 3. Hong Kong 4. Boston

Step 2 : Answer to the question "Where is the world's largest underground walkway?"

Toronto - Want an underground walkway where you can do cartwheels? PATH, located in Toronto, is the largest underground walkway in the world and, according to Guinness World Records, the largest underground shopping complex too. With its 19 miles of shopping arcades and 4 million square feet of retail space, you’re bound to find what you’re looking for in one of the mall’s 1,200 shops. Just enter the underground path through one of more than 50 office buildings, department stores, hotels, subway stations, or parking garages.:

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