Invisibility Task Force

The Invisibility Task Force is one of the main offices of the Department of Magical Accidents and Catastrophes and is located on the third floor of the Ministry of Magic.

The office presumabley specifies in the concealment of the wizarding world to Muggle eyes, for example, casting certain advanced spells to hide and protect magical buildings and other magical areas of importance.

Quidditch World Cup Stadium
It is likely that it was this office that casted the spell which makes Muggles to suddenly remember urgent appointments when they get too near the site of the Quidditch World Cup Stadium.

Hogwarts
It is also likely that it was this office that casted the spell which makes Muggles see an old ruin of a castle when they are really looking at Hogwarts School of Witchcraft and Wizardry. It is likely that the office also made the castle Unplottable.

Azkaban
Azkaban, the wizarding prison, is also Unplottable, and has certain concealment charms placed on it, hiding it from Muggle view. It is presumed that it was this office that made it so.

Appearances

 * Harry Potter and the Deathly Hallows