The Black Forest

The Ministry of Magic
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The Ministry's two main functions are to govern the wizarding world and to keep all knowledge of this world from Muggles (except for the Prime Minister).  A typical government institution, the Ministry employs hundreds of people in dozens of different organizations.
 
To help visualize the layout of the Ministry, picture a multi-story office building completely buried undrground.  Courtroom ten and the Department of Mysteries would be in the sub-basement and basement of the building, the Atrium would be the building's "ground floor" and all other Departments would be located above.

Level Two - Department of Magical Law Enforcement

Level Three - Department of Magical Accidents and Catastrophes

Level Four - Department for the Regulation and Control of Magical Creatures

Level Five - Department of International Magical Co-operation

Level Six - Department of Magical Transportation

Level Seven - Department of Magical Games and Sports

Level Eight - The Atrium

Level Nine - Department of Mysteries