12 Grimmauld Place is the home of Regulus Black and his parents. Sirius Black used to live here as well before he ran away from home. It is located in London, in a Muggle neighbourhood, and the location is protected by a Fidelius Charm. As the house is invisible to the neighbourhood residents, the local Muggles have long since accepted the mistake in numbering which landed number 13 next to number 11.
