Underground city

An underground city is a network of tunnels that connects buildings underground. Typically, these are located in inner cities. Connect, among other authorities, department stores, train stations and subway stations with each other. Access to these networks will usually allow plenty of common inputs.

Underground cities are sometimes in cities that are in a cold climate so that public life can vonstattengehen regardless of the weather.

The most famous underground city, the Ville intérieure in the Canadian city of Montreal. This includes approximately 32 km of tunnels and extends over 12 square kilometers, making it forms the world's longest tunnel network. The tunnel system PATH in Toronto has the largest retail space.

In Germany, there are several cities in greater pedestrian tunnel systems. In Frankfurt am Main each exist so-called B levels in numerous underground and S-Bahn stations. In Hamburg, the stations " Virgin Rose " and " town hall " through pedestrian tunnels are interconnected. In Stuttgart, a larger shopping street connects the railway station with the King's Road. In Munich several underground intermediate floors underground station stations and underground train stations, which are called barrier levels exist. The two largest tunnel systems of the city are the main train station and under the Karlsplatz ( Stachus) city rail and underground station. These are just 100 meters apart and are connected indirectly through a department store, which has to both basements connection, as well as subway and commuter rail lines.

In Switzerland, Geneva and Zurich have ( ShopVille ) large underground shopping centers.

In Paris, longer distances can be covered on foot underground, by use of the extensive tunnel network access and call the Metro. In some stations, such as Montparnasse, there are even treadmills.

The northern French town of Arras is tunneled. During the First World War, the Allies were able to maintain Arras against all attacks of the Germans - mainly thanks to a gigantic scale, below the city tunnel system in which up to 24,000 soldiers could be accommodated.