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Cosmos Tour: Prague Vienna Budapest – Prague Underground Tunnels
Prague is the only capital city which has 90 km of underground tunnels (called kolektory) in a huge network including gas and steam pipes, water mains, to a pneumatic postal service, high and low voltage cables, telecommunications cables and also special networks connecting individual companies. Some are 30-40 meters underground, and a special train runs on five-km routes transporting pipes, metal parts and other components here and there.
You can tour them.