The underground city is promoted as an important tourist attraction by most Montreal travel guidebooks, and as an urban planning achievement it is impressive. For most Montrealers, however, it tends to be considered more as a large mall complex linking Metro stations — they may not even know they are in it. Many Canadian cities have some kind of tunnel or skywalk system downtown to help people avoid the weather. Most parts of the Montreal underground city are open while the Metro is in operation (5:30 AM to 1:00 AM), though some are closed outside of business hours. Maps of the underground city and the Metro can be obtained free of charge from all Metro stations, and the network of buildings is indicated on most maps of the downtown core.