The tour is obliged and needs to be booked in advance. The tour only allow you to visit a 10% of the whole building. The building is the second biggest in the world and holds an impressive history in its construction (eg./ only for its cleaning needs a staff of 800 people). The guide did not want to respond what's the use of the 90 netters bunker underneath and the tunnels that connect the building across the city.
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