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Underground city

An underground city is a network of underground tunnels that connect buildings, usually in the downtown area of a city. These may include office blocks, shopping malls, train and metro stations, theatres, and other attractions. An underground city can usually be accessed through the public space of any of the buildings connecting to it, and sometimes has separate entries as well.

Underground cities are especially important in cities with cold climates, as they permit the downtown core to be enjoyed year round without regard to the weather.

Underground cities are similar in nature to skyway systems and may include some buildings linked by skyways or above-ground corridors rather than underground.

Cities with underground cities include: