Underground City

Montreal's Underground City, or RÉSO, is an impressive subterranean pedestrian network that spans 20 miles of tunnels. The network is largely climate-controlled, making it a perfect escape from Montreal's harsh weather conditions, especially during winter. You can find over 1,600 shops and facilities within the city and it connects three major shopping malls, hotels, offices, and more. It's also a great way to get to the metro, or spots like Place des Arts and Chinatown. It's easy to get lost, so join a walking tour to help you navigate the city and discover all the cool art and architecture. – Tripadvisor